Xylem contains specialized cells that provide support for a plant stem. How does the structure of one of these cells help it carry out this function? A. It changes shape to allow gas exchange.

B. It sticks out from the stem.

C. It has stiff walls.

D. It has tiny openings.

How many major plates cover the earth

Need an answer asap 45 points and brainlest to the first person to answer why do scientific theories, such as biological and chemical evolution, represent the strongest explanation of the changes observed in the fossil record. must be in sentence form how can scientific theories on evolution and the fossil record change over time? must be in sentence form

When ash and dust begin to settle on the ground, they eventually become compacted by