How many layers are there in the skin? Why do you think those layers are structured differently? Why is it important to have multiple layers?

What was the land like over 500 million years ago? what was under the sea?

The blue particles in this image are able to cross the cell membrane through simple diffusion. how will they be transported? outside the cell inside the cell o a. the substances will move directly across the membrane from outside the cell to inside the cell. b. the substances will move through channels in the membrane proteins from outside the cell to inside the cell. o c. the substances will move through channels in the membrane proteins from inside the cell to outside the cell. o d. the substances will move directly across the membrane from inside the cell to outside the cell.

The combining form leuk/o means red true or false