Alexander applies sunscreen to help provide protection from ultraviolet radiation. With what does the atmosphere provide protection for Earth? A. Thick layers of ice clouds.

B. Ozone in the upper atmosphere

C. Water vapor in the lower atmosphere

D. The reflective surface of the ocean

its going to be mutualism cuz they both benefit from the relationship.

~batmans wife dun dun

it means there are 3 atoms of oxygen

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

i think? ?