A scientist notices that the level of toxic chemicals in an algae plant is 400 ppm. A consumer called zooplankton eat the algae. What level of toxic chemicals
would the scientist discover in the zooplankton?
4 ppm
400 ppm
4,000 ppm
40,000 ppm

Which statement describes a way in which the digestive and excretory systems work together? a. the nephrons absorb nutrients from food going to the large intestine. b. the excretory system balances blood gases in the small intestine. c. the intestinal villi filter blood and send wastes to the bladder. d. the excretory system balances the salts and water obtained from digested food

The open ocean of any depth is called the

When you exhale, air in you lungs moves from the does anyone know the correct answer on apex