Homologous structures are physical features that are similar in form or function, but which have evolved separately in different species. These structures provide evidence for the theory of evolution by common descent, which proposes that all living organisms share a common ancestor and that they have evolved over time through a process of natural selection.
Some examples of homologous structures include:
The wings of birds, the wings of bats, and the arms of humans. These structures have different functions (flying, grasping, etc.), but they have a similar skeletal structure and are made up of bones that have a similar arrangement and shape. This suggests that they have a common evolutionary origin.
The fins of fish and the legs of reptiles. The bones in the fins of fish and the legs of reptiles are similar in shape and arrangement, indicating that they may have evolved from a common ancestor.
The gills of fish and the lungs of mammals. Both gills and lungs are used for respiration, but they have evolved independently in different groups of organisms. The similarities between the two structures suggest that they may have evolved from a common ancestor.
Homologous structures are one type of evidence that is used to support the theory of evolution. Other types of evidence include the fossil record, comparative anatomy, and molecular biology.
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Which of the following is an indication that a substance has undergone a chemical change?
A.
No new product has been formed.
B.
The color of the substance has not changed.
C.
The original constitute has not changed.
D.
The molecular structure has changed.
Answer:
D.
Hope it helps!!!!!!!!!
Are the following equations balanced or unbalanced?
1. SnO2 + 2H2 → Sn + 2 H2O
2. 4NH3 + 5O2 → 4NO + 6H2O
3. 2B2Br6 + 5HNO3 2 B(NO3)3 + HBr
4. 2KNO3 + 1H2CO3 → 1K2CO3 + 2HNO3
What do greenhouse gases (CO2) do to the atmosphere?
Answer:
they causes climate change by trapping heat and also they contribute to respiratory diseases from smog and air pollution
Answer:
They add C02 to our atmosphere which can give plants and soils more CO2. It can also make our earths temperature change a ton!
Explanation:
Greenhouse gases produce an increase in the average surface temperature of the earth over time.
Why would you rather have hot cocoa than lemonade on a cold day? (The lesson is called heat transfer)
Answer:
you would more than likely have hot coca.
Explanation:
Because when its cold out you don't want something cold, its common sense lol.
how many atoms in 1kg of platinum
a 2.5x10^24
b 3.1x10^24
Answer:
3.1x10^24 it will be in 1 kg of platinum
Which pieces of equipment are
needed to calculate the velocity of a
falling object?
A stopwatch and balance
B speedometer and magnet
C compass and tape measure
D tape measure and stopwatch
How many grams is 2.393 x 10^24 atoms of O?
70.45 g O
140.9 g O
63.58 mole O
63.58 g O
Answer:
63.58 g O
Explanation:
To calculate the mass of O atoms, the number of moles of O atoms are needed and can be calculated as follows:
n (no. of moles) = nA ÷ 6.02 × 10^23
n = 2.393 x 10^24 ÷ 6.02 × 10^23
n = 0.398 × 10^ (24-23)
n = 0.398 × 10^1
n = 3.98moles.
To calculate the mass of Oxygen, we use the following formula:
moles = mass/molar mass
Molar mass of O = 16.
3.98 = m/16
m = 3.98 × 16
m = 63.68grams of Oxygen.
Answer:
Solution given:
[tex]1 mole \:of O=6.023×10^{23} atoms[/tex]
1 mole of O =16g
we have
[tex] 6.023×10^{23} atoms\: of O=16g[/tex]
now
[tex] 2.393 × 10^{24} atoms\: of \:O\\=16/6.023×10^{23}*2.393 x 10^{24}g\\=63.57g[/tex]
63.57g is a required mass of O.
what is the formula for water
Answer:
H2O
Explanation:
EASIEST FORMULA ON EARTH
Calculate the pH for a 1.0 x 10-5 M solution of OH at 25°C.
pH = -log[H*), pOH = -log[OH-]
14 = pH + POH
0 pH = 11.00
0 pH = 9.00
0 pH = 6.00
0 pH = 3.00
Answer:
ph=9.00
Explanation:
Given 1.0x10^-15M of OH at 25c
first find Poh from Poh=-log[OH]
then Poh=-log[1.0x10^-5]
from above Ph=5
then find Ph from ph+poh =pw
where pw=14
so
ph+5=14
ph=9.00
The pH for a 1.0 x 10-5 M solution of OH at 25°C is 9.
What is pH?pH is a measure of acidity and basicity of aqueous solution. The range of pH goes from 0 - 14, with 7 being neutral. pH of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base.pH is the measure of the relative amount of free hydrogen and hydroxyl ions in aqueous or other solutions.In water pH + pOH=14
pH = 14 - pOH = 14 - 5 = 9
From definition, pOH = - log₁₀ [OH⁻]
Thus pOH = -log₁₀ (1 x 10⁻⁵)
= - (-5) = 5
pH + pOH = 14
pH = 14 - pOH
= 14 - 5 = 9
pH = 9
Hence, pH = 9 is the correct answer.
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How many moles of CO2 are in 54.3 g of CO2 ?
Answer:
There is actually 1 mole in 54.3 g of CO2
A 25.0 mL sample of HCI reacted with 20.0 mL of 2.00 M NaOH. What is the molarity of the HCI?
HCl(aq) + NaOH(aq) —> NaCl(aq) + H2O(l)
really need help!
Answer:
Molarity of HCl = 1.6M
Explanation:
The chemical reaction equation is;
HCl(aq) + NaOH(aq) —> NaCl(aq) + H2O(l)
Now, molarity = number of moles/volume
Thus, for NaOH, we have;
Number of moles = molarity × volume = 2M × (20/1000) L
Number of moles = 0.04 moles
Using the coefficients in the chemical equation above, we can find the corresponding number of moles for HCl.
Number of moles of HCl = 0.04 moles NaOH × (1 mole of HCl/1 mole of HCl) = 0.04 moles of HCl
Thus;
Molarity of HCl = 0.04/(25/1000)
Molarity of HCl = 1.6M
number 1 ............
Answer:
I am guessing it is B. Non-metal, metals, metalloids
A football is moving upwards towards its peak after having been booted by the punter.
Answer:
draw a square with an errow pointing down
Explanation:
Based on Reference Table F, describe the solubility of zinc sulfide in water.
Answer:
negligible
Explanation:
negligible meaning its not very soluble in water at all
(wikipedia)
What is the half life of this element?
A. 80 days B. 40 days C. 5 days D. 10 days
Answer:
c. 5days
Explanation:
there is no question but if it's a graph
the answer is 5days
PLEASE Answer asap! Compare two periodic families below. You must include at least two facts about each family. You may use any description of properties or periodic trends to help you.
Answer:
The alkali metals/group 1 are recognized as a group and family of elements. These elements are metals. Sodium and potassium are examples of elements in this family. Hydrogen is not considered an alkali metal because the gas does not exhibit the typical properties of the group. The largest family of elements consists of transition metals/group 3-12/group 3a. The center of the periodic table contains the transition metals, plus the two rows below the body of the table (lanthanides and actinides) are special transition metals. Even though both are metals, transition metals have higher melting points; they have higher density; they are less reactive with water; they react and form ions with different charges, but Group 1 metals only form 1+ ions. (Hope the is helpful! You can reword it if you want...)
ANSWER ASAP Please! How do groups and periods differ? What trend specifically occurs in either?
What is the volume of a balloon that contains 3.7 moles of helium at 75°C
and 5.1 atm?
Answer: your question is easy 21 L
By using ideal gas law the amount of volume will be 21 L.
What is ideal gas law?
The general gas equation, commonly known as the ideal gas law, is the state equation of a hypothetical ideal gas.
Calculation of volume by using ideal gas law.
Given data:
P = 5.1 atm
n = 3.7 moles
T = 75°C (273 + 75) = 348 K
V = ?
Put the given data in ideal gas law.
PV = nRT
V = nRT / P
V = 3.7 × 8.31 × 348 / 5.1
V = 2098
V = 21 L
Therefore, By using ideal gas law the amount of volume will be 21 L.
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1 How do I make a girl blush?
2 How do I know if I girl might like me by looking at her body language?
Answer:
1. Make Her Smile with You. Your smile is something which can turn the tables for you, if you possess a nice smile then it is no doubt a plus point for you or flirt with her.
2. She tilts her head while looking at you.
She constantly 'fixes' her hair, makeup, or clothing.
She returns your physical touches.
She stares or looks over at you a lot.
She blushes around you.
Explanation:
Use words from the box to complete the sentences.
fungi pathogen poison vaccine virus
(a) A bacteria that can cause a disease is an example of a..................................
(b) An obligate parasite that must inhabit a host cell to reproduce is a ...................................
Answer:
a) pathogen
b) virus
Explanation:
pathogens are harmful bacteria
viruses depend on the host to survive
Iron (III) nitrate (Fe(NO3)3) solution reacts with sodium hydroxide (NaOH) solution to form a
brown precipitate of iron (III) hydroxide (Fe(OH)3). Sodium nitrate (NaNO3) remains in solution as
it is a soluble compound.
Write the word equation and the balanced formula equation for this reaction.
Answer:
Fe(NO3)3 + 3 NaOH ===》Fe(OH)3 + 3 NaNO3
Write the complete balanced equation for Manganese & sulfuric acid --> Manganese (II) sulfate & water & sulfur dioxide
no spaces
no subscripts
no 1's for coefficients
WILL GIVE BRAINLIEST!
Answer:
I kinda forgot. I'm sorry if I didn't answer your question.
Explanation:
HELP ME!!!! What is the gravitational potential energy stored in a church bell with a mass of 60 Kg hanging in a church steeple that is 20 m high?
A. 1200 J
B. 1960 J
C. 235,200 J
D. 11, 760 J
Answer:
A
Explanation:
1. What is the symbol for atomic mass? What are the units of atomic mass in terms of atoms? 2. What is the symbol for molar mass? What are the units of molar mass? 3. What is the atomic mass of iron, with units? 4. What is the molar mass of iron, with units? 5. What is formula mass? What are the units of formula mass? 6. What is the formula mass of sodium bicarbonate, with units? 7. What is the molar mass of sodium bicarbonate with units? 8. What is the molar mass of water? 9. What is the molar mass of ammonia, NH3? 10. What is the molar mass of lithium oxide? 11. What is the molar mass magnesium bicarbonate? 12. What is the molar mass of cobalt(III) carbonate?
i am NOT gonna read all of that
explain why copper 2 oxide is a base although it does not turn litmus paper to blue
Answer:
See explanation
Explanation:
Copper II oxide is a base but not an alkali. An alkali is a soluble base. Since Copper II oxide is not soluble in water then it is not an alkali.
Let us recall that the change of colour of litmus with an alkali requires the presence of water. In the absence of water, solid Copper II oxide does not turn red litmus paper blue.
The ability to turn red litmus paper blue is commonly observed with alkalis and Copper II oxide is not an alkali.
Also recall that since Copper II oxide is not soluble, hydroxide ions are absent hence Copper II oxide does not turn red litmus paper blue.
Question is in picture
Answer:
30
Explanation:
I believe it's 30 because half of 24 is 12 and that is its half life. And as you know it took 30 minutes to get there.
can someone pleaze help me
Answer:
I think its the last one
Explanation:
Super sorry if its incorrect.
If we have 0.072 g of FeCl3 then how many moles are there?
Answer:
~0.0004
Explanation:
[tex]n=\frac{m}{M}[/tex]
n=0.072/(56+(35.5*3))=0.072/162.5~~0.004
Of the following elements ____ can form a rare +4 ion *
a) Aluminum
b) Lead
c) Krypton
d) Uranium
Answer:
d is the answer.........
9. In a laboratory experiment, two groups of rats are fed two different fatty acids as their sole source of carbon for a month. The first group gets heptanoic acid (7:0), and the second gets octanoic acid (8:0). After the experiment, a striking difference is seen between the two groups. Those in the first group are healthy and have gained weight, whereas those in the second group are weak and have lost weight as a result of losing muscle mass. What is the biochemical basis for this difference
Answer:
Beta oxidation of the odd chain heptanoic acid will produce propionyl CoA, which can be converted in several steps to oxaloacetate. Oxaloacetate is the starting material for the process of gluconeogenesis (producing glucose from noncarbohydrate precursors). This gives extra glucose to the first group, so they will be healthier and gain weight. Beta oxidation of the even chain will entirely be oxidized to acetyl Co-A (one of the precursors of the TCA cycle). This will lead to a large excess of ketone bodies instead of glucose for energy, which will lead to the second group being weak and losing weight.
Explanation:
The difference is seen in having an odd chain and an even chain of fatty acids and how they are broken down and used in the body.