Why don't arteries need valves

Which describes an effect that ocean currents have on short-term climate change? A) Ocean currents increase the strength of prevailing winds, which can cool the air and land. B) Ocean currents can carry cold water, which can cool the air and land.

If someone is skateboarding down a hill which type of energy is decreasing

Hemophilia is a condition in which blood does not clot naturally, and a person with hemophilia could bleed to death if injured. A hemophiliac must receive regular injections of which blood part to stay alive? A. red blood cells B.

Explain how the interconnectedness of living and nonliving things is shown in the biogeochemical cycles.

How do environmental scientists use technology to track polar bears?

Explain: In dominant/recessive inheritance patterns, the dominant allele is always expressed when present. The recessive allele is only expressed when the dominant allele is not present.

Chemicals that kill bacteria or slow their growth are called

As you reach for a rose, you unexpectedly feel the painful poke of a thorn. you quickly withdraw your hand. which part of this process is accomplished mainly by the central nervous system?

Which of the following steps is an important part of the process by which ecology guides human to a sustainable future?

Estuaries are very productive ecosystems because they receive nutrients from rivers and oceans. a. True b. False