For diffusion to occur, which condition must be met?

a) a concentration gradient must exist.
b) a hypotonic external environment is required.
c) a hypertonic external environment is required.
d) dynamic equilibrium must exist.

From which layer of atmosphere is the top layer of the thermosphere? a. troposphere b. stratosphere c. mesosphere d. exosphere hurry me i will give a braineilst

Wind energy is plentiful in regions with vast open spaces it is a non polluting renewable resource what could be an economic factor that makes the use of this resource less feasible then non renewable resource even in such regions

Use the drop-down menu to match the following definitions to the corresponding terms. the total variety of organisms that live in the biosphere a group of organisms that breed and produce offspring that can breed all of the biotic and abiotic factors in an area