Which statement is true of diffusion?

a: molecules move from areas of high concentration to areas of low concentration.

b: diffusion requires energy input from the cell.

c: only water can diffuse across a cell membrane.

d: diffusion is only important for animal cells.

Why do mutations in genes affect traits? o a. genes determine what type of mutagens an organism has. o b. genes produce proteins that cause traits. o c. genes affect how many chromosomes an organism has o d. genes code for carbohydrates that influence traits.

Ture or false evidence for evolution includes millions of fossils

Ivan is looking at a cross section of a stem taken from a vascular plant. he sees two different types of vascular tissue: the xylem, which is closer to the center of the stem, and the phloem, located around the xylem, closer to the outside of the stem. how do these two structures work together in a living plant?