What type of bacteria converts the ammonia and ammonium into nitrates and nitrites?

Which substance plays a central role in determining the rate of sodium reabsorption? which substance plays a central role in determining the rate of sodium reabsorption? adh aldosterone extracellular fluid natriuretic peptides epinephrine?

The fusion of gametes is called

What type of lipid is estrogen? a. steroid b. phospholipid c. triglyceride d. wax

At which stage of life do physical abilities reach their peak?

Which process increases the salinity of ocean water? a. the Coriolis effect c. evaporation b. convection currents d. continental deflection

You have likely heard of investigators using DNA fingerprinting to identify individuals in crime scene investigations. Briefly describe your current understanding of the process of DNA fingerprinting.

Which autonomic system conserves energy by returning the body to a normal activity level through a lowered heart rate and blood pressure? a peripheral nervous systemb sympathetic nervous systemc somatic nervous systemd parasympathetic nervous system

The science of heredity

At which age range does the most intensive myelination of nerve cells occur?

The role of the excretory system is to rid the body of toxic waste products. Which of the following body systems also plays a direct role in removing waste products from the body? A) endocrine B) nervous C) respiratory D) skeletal