why do leaves appear green in color. A. because of cellular respiration or b. because of lack of oxygen c. because of the presence of chlorophy d. because of lactic acid fermentation

Which of the following would slow down gas exchange between the blood and alveolar air? A decrease in nitrogen solubility An increase in respiratory rate An increase in membrane thickness A decrease in membrane thickness An increase in alveolar

13. The worst problem a person with no pancreas would face would be A. inability to neutralize stomach acid B. inability to digest proteins C. inability to absorb carbohydrates D. inability to emulsify liquids

Minerals in geodes form spectacular euhedral crystals because

Eight weeks after conception the embryo has formed almost all the basic organs true or false

Why is the carbon cycle important?

What does food supply all living things with for life activities?

An 8-year-old has scabs and fluid-filled vesicles on her face, throat and stomach. Three weeks earlier she had visited her grandmother who had shingles. What infection does the 8-year-old have

Tropical forests contain dense trees, which allow less sunlight to penetrate. Emergent trees are trees that grow to a height of more than 45 to 55 meters, above the usual height of trees in tropical forests.

B. Explain Why do communities change over time

Cells that protect the body by engulfing foreign cells or producing antibodies are a. red blood cells b. cilia c. platelets d. white blood cells