Input: Answer this question:
The male insects in a population are treated to prevent sperm production. Would this reduce this insect population?
OPTIONS:
- No, because the insects would still mate.
- No, because it would not change the offspring mutation rate.
- Yes, because it would sharply decrease the reproduction rate.
- Yes, because the males would die.
Answer: Yes, because it would sharply decrease the reproduction rate.

*Question*: In addition to oxygen, which gases make up the largest percentage of Earth's atmosphere? OPTIONS:
- hydrogen, helium, and water vapor
- hydrogen, methane, and ozone
- carbon dioxide, water vapor, and nitrogen
- carbon dioxide, methane, and helium
*Answer*: carbon dioxide, water vapor, and nitrogen

question:
When carbon and oxygen combine chemically, the mass of the product is
OPTIONS:
- greater than the mass of the carbon plus the mass of the oxygen
- equal to the mass of the carbon plus the mass of the oxygen
- equal to the mass of the carbon
- less than the mass of the carbon

answer:
equal to the mass of the carbon plus the mass of the oxygen

[Q]: Researchers recently discovered a gene in humans that previously was unknown to science. Which statement best explains why the gene probably was not discovered much sooner?
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OPTIONS:
- The gene only recently evolved in humans.
- The technology used to study genes is still being developed.
- Scientists were not interested in genes until a few years ago.
- Scientists were sure they had already discovered every possible gene.
****
[A]: The technology used to study genes is still being developed.

question below:
Typically, sedimentary rocks are formed
OPTIONS:
- only in erupting volcanoes.
- only under great pressure and high temperatures.
- below Earth's surface as magma cools and crystallizes.
- from materials that settle.
answer below:
from materials that settle.

question below:
Which characteristic is shared by all cells?
OPTIONS:
- They need energy.
- They reproduce sexually.
- They make their own food.
- They move from place to place.
answer below:
They need energy.