Contemporary landscapes result from many causes, including variability in abiotic conditions, such as climate, topography, and soils; biotic interactions, such as competition, mutualism, herbivory, and predation, that can generate spatial pattern even when environmental conditions are homogenous; natural disturbances. I hope this helps :)
Answer:
B. diffusion
Explanation:
Because diffusion is a passive process, it does not require energy expenditure by the cell.
The variety of all life forms on Earth.
