What is an organic acid.

5. Which of the following statements is true of a scientific theory? A. It's an accepted explanation for how the world works. B. It explains what happens but not how it happens. C. It's a guess accepted by a few scientists. D.

Facilitated diffusion differs from ordinary diffusion in that

If you wanted to conserve topsoil, which of the following actions would be the best one to take? A. fixing a leaky faucet B. limiting carbon emissions C. requiring emissions testing D. utilizing contour planting techniques

The waste product eliminated by the lungs is carbon dioxide. a. True b. False

3. A living thing made of many cells is called a organism.

Which of following cells don't play endocrine Role a. interstitial cells. B. follicle cells. c. germinal epithelium cells. D. leutal cells

The Permian-Triassic extinction 250 million years ago wiped out about ninety percent of Earth's animal species. Some scientists are predicting a sixth mass extinction in the future, due to A) acid rain. B) air pollution. C) global warming.

Which cell organelles function resembles the function of the brain in higher animals

92 Sathe best for the question 11. Most animals and plants reproduce sexually. This means that DNA is passed down to new organisms from two parental organisms. Which of the following is a key advantage of sexual reproduction?

Which symptom is not associated with vitamin b deficiency?