What two things must happen for diffusion to occur?

Which of the following resulted from a genetic variation that was favored by natural selection? A. cancer in a lab rat B. the long neck of a giraffe C. the small size of a Chihuahua D. smoothness of a river rock

A drought causes a wildfire which destroys a forest. Which Earth systems interact during this process?

The unit "GtC" is used throughout the lab and stands for gigatonnes of carbon. What is one GtC equal to? A: one billion kilograms of carbon B: one hundred kilograms of carbon C: one thousand kilograms of carbon D: one trillion kilograms of carbon

What have biologist have discovered ways can reduce the symptoms of diseases

Which substance is a compound?

Which of these is an example of an extinction that has been witnessed by humans?

What is the region within a dividing cell where chromatids and homologous chromosomes align in both mitosis and meiosis

A judgment formed, based on the data gathered in an experiment is an?

You are in a desert on a hot day and see water in the distance. It's not really there, but results from refraction of light.

Dna contains all the information a cell needs in order to make certain proteins. where are the protein-synthesizing instructions stored on a dna molecule?