the cell membrane of a red blood cell will allow water, oxygen, carbon dioxide, and glucose to pass through. since other substances are blocked from coming in, this membrane is called

a. perforated.
b. semi-permeable.
c. non-conductive.
d. permeable.

Classify the structures as homologous or analogous, depending on their structure and function.

The kind of fertilization found in the majority of aquatic animals is (internal or external) fertilization.

The image below shows a common blood pressure gauge. what does this device do? a. measures the level of oxygen present in the blood b. measures the pressure of blood when the lungs expand and compress c. measures the electrical activity of the heart d. measures the pressure of blood when the heart contracts and relaxes