The cell membrane protects the cell, separates the internal and external environments, and does not allow any material to enter or exit the cell.

Classify each component according to whether it is present in a plant cell only, an animal cell only, or both plant and animal cells.

Why have improvements in microscopes over time resulted in revisions in the cell theory

What was the science of classification and naming organisms based on the different characteristics called?

The remove waste from the blood

A 50-year-old with Parkinson's disease would need which of the following? a) verbalize feelings of loss b) information about the disease c) protection from infection d) access to medications and food

A) What are the bases of mRNA coded for by this section of DNA before the mutation? Hint in RNA A pairs with U.

How does secondary succession differ from primary succession? It begins where no plants have grown. It begins on bare rock or land. Soil nutrients are already in place. Lichens and mosses form soil first.

True of False? The structure of the cell membrane is what allows water and other molecules to move in and out of cells.

Dolphins and fish have similar body shapes. isthis feature more likely a homologous or analogoustrait?

Which of the following is not a phase of gastric secretion? A. cephalic B. gastric C. intestinal D. enterogastric