As a nitrogen-containing compound, ammonia is a .
a. significant component of urine of insects, as well as birds and other reptiles
b. significant component of urine of mammals
c. waste product of amino acid and nucleic acid breakdown
d. mixture of water and soluble wastes formed and excreted by the vertebrate urinary system
e. blood-filtering, urine-forming agent for mammals.

Which term describes a normal value for something in the body? a.homeostasis b.set point c.feedback loop d.integration center

Astudent wants to test the hypothesis that fertilizer improves the growth rate of grass seeds. to test this hypothesis, the student put the same amount of grass seed in 3 containers with the same type of soil. the student measured the growth at the end of the week. all plants received equal amounts of water and sunlight. if you were asked to graph this data, what would you place on the x-axis? a. fertilizer b. water c. plant growth d. week one

Which macromolecule catalyzes chemical reactions this be considered enzyme chemical reactions thus he considering enzymes