Hormones that regulate blood calcium levels are made by the a. parathyroid gland. b. pancreas. c. thymus gland. d. adrenal gland.

What kind of seafood would you expect to have the highest levels of mercury and why? kelp, because they use the sun to photosynthesize on the bottom trophic level. oysters, because they filter feed on plankton on a lower trophic level. small fish, because they eat plankton on a higher trophic level. sharks, because they feed on organisms on a higher trophic level.

Is a measure of the different types of organisms in a community. question options: tertiary secondary primary none of the above

The dense layer of connective tissue that surrounds an entire skeletal muscle is the