Identify the greenhouse gases that make the greenhouse effect possible. Check all that apply.

water vapor

nitrogen

carbon dioxide

methane

nitrous oxide

Which of the following statement is true? a. A cell's phenotype is determined by its DNA and its genotype is determined by its proteins. b. A cell's genotype is determined by its DNA and its phenotype is determined by its proteins. c.

Compare the chromosome number of a cell before and after mitosis

Explain how muscles are affected by space travel

A plant would not be able to complete photosynthesis without

What allows the population to grow so rapidly

In general, what is not affected by the ingestion of caffeine? a. behavioral consequences of alcohol intoxication b. the risk of cardiovascular disease c. the time it takes to fall asleep d. performance of boring or repetitive tasks

What is the function of topoisomerase? a. relieving strain in the DNA ahead of the replication fork b. elongation of new DNA at a replication fork by addition of nucleotides to the existing chain c. the addition of methyl groups to bases of DNA d.

Can natural selection cause new variation?

The first step of biologists takes when deciding how to study life is to___.

If rabbits gave birth to two young every two years, like bears, what would happen?