All of the following are correct functions of the excretory system except
a. to excrete urea, uric acid and excess salts.
b. to secrete the hormone erythropoietin from the kidneys which stimulates the production of rbcs.
c. to maintain sufficient macro-nutrients for body functions d. to maintain homeostasis of body fluids and salts.

Cells tend to have a relatively small and uniform size. why aren’t cells larger?

Diego conducted an experiment to find out what kind of ball bounces the highest when dropped from a five-foot platform. he used a golf ball, a tennis ball, and a soccer ball. he dropped each ball from the balcony once. diego recorded his observations after each drop. what can diego do to best improve the reliability of his results? a) drop each ball from the platform three more times b) record his observations in more than one unit c) write at least two scientific questions after the experiment is complete d) share his results with other people who have done similar experiments you for the !

Vaccines are weakened forms of disease causing microorganisms, which are given to patients to prevent disease. after the vaccine is administered, the immune system responds by creating a(n) to recognize the a.) antibody, antibiotic b.) antigen, antibody c.)antibiotic, antibody d.)antibody, antigen