Which form of cell transport allows small molecules to move from an area of higher concentration to an area of lower concentration without energy being required from the cell?
a) osmosis
b) pinocytosis
c) phagocytosis
simple diffusion

The eruption of a nearby volcano causes a prairie ecosystem to receive a lot less sunlight.which of these is the most likely effect on the ecosystem? a-an increase in biodiversity. b-an increase in immigration to the area. c-a decrease in available water. d-a decrease in plant growth.

What is responsible for the uneven heating between the poles and the equator on any given day

Which statement describes how favorable traits in a population relate to natural selection? they are the only traits that ever exist in the population. they build in the population over time. they are rarely passed on to offspring. they are found only in a few individuals within the population.