The principal characteristic that determines whether an aquatic ecosystem is classified as marine or freshwater is
a. surface area
b. water depth
c. temperature
d. salinity

Which level of consumer had access to the smallest apply of energy

Match the functions to the cell types ? contraction and relaxation. conducting electrochemical signals fighting diseases carrying genetic material

Suppose you use three different scale to weigh a bag of organges. one scale says the nag weighs 2.1 lb, and third says it weighs 2.1 lb. the actual weight of the bag of organges is 2.153 lb. which of the following best decribes these results?