All interactions between the atmosphere and geosphere involve
a. soil and living things
b. water and living things
c. soil and gases or particles in air
d. gases or particles in air and water

The bacteria found in soil is usually harmful and measures are taken to remove any traces of microorganisms. true or false

What are the fixed alleles in the human species? o a. the alleles that are on the most chromosomes b. the alleles that change most often 000 c. the alleles that no one has d. the alleles that everyone has

Amino acids contain the elements carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur. of the 20 amino acids found in humans, 11 are called "nonessential" because they can be manufactured by the body when needed. which elements in these 11 amino acids are commonly obtained from the metabolism of sugar molecules?