Which best describes the role of the nephrons?
Nephrons collect salts to be stored for later use by the body.
Nephrons signal the bladder to release excess urine.
Nephrons transport urine to the bladder.
Nephrons restore the substances and water the body needs.

The germs that cause infections are mainly spread in what three ways? a. immunization, mucous membranes, not washing hands b. germ-laden droplets, direct contact with body fluids, insects c. hand hygiene, sickness, immunization d. not enough sleep, low oral hygiene, germs

Antibiotics are given when an std is caused by a virus. true or false

In which book word demography is used for first time