What is the envelope of gas that surrounds earth?
a. atmosphere
b. biosphere
c. cryosphere
d. geosphere
e. hydrosphere

Aeukaryotic cell must be from a plant if the cell a) a nucleus b) a nuclear envelope c) cytoplasm d) a cell wall

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.

The negative change found inside the plasma membrane is created by potassium ions sodium ions hydrogen ions chlorine ions