Why is a stimulus required for a muscle to contract?

Where does most of the growth in the world occur? * 1. in developed countries 2. in developing countries 3. in the united states 4. in rural areas

What evidence supports the law of conservation of energy? Mechanical energy is converted to chemical energy during photosynthesis. Oxygen is made from the breakdown of carbon dioxide during photosynthesis.

Why do some volcanic eruptions consist mostly of lava flows, while others are explosive and have no flow?

Why can't a damaged cell in the brain be replaced?

Clinical manifestations of radiation injury result from acute cell injury, dose-dependent changes in the blood vessels that supply the irradiated tissues, and fibrotic tissue replacement. What are these clinical manifestations?

How does deficit spending affect the national debt?

Which type of selection tends to increase genetic variation?

What happens to sedimentary rocks on Earth's surface?

Which best explains the reason for daily high and low tides? A. Warm, less-dense water rises, moving cold dense water toward the shore. B. Volcanic activity on the ocean floor causes water to swell. C.

Over various spans of time, human populations have increased, decreased, or remained the same, and at both global and local levels.