What is a plasma membrane?

Depolarization, the process by which muscle fibers are stimulated to contract, occurs when: A. calcium ions rapidly enter the cell, facilitating contraction. B. potassium ions escape from the cell through specialized channels. C.

A time machine transports you to the year 8,567 AD. You are surprised to learn that Homo sapiens have evolved into three distinct species. Explain how this might have occurred.

Which plant adaptation would likely be found in the taiga? A) aerial roots to avoid flooding B) extremely large and broad leaves C) small needle-like evergreen leaves D) large fleshy stems that store water

Josephine works in a biology lab at UCLA and they have recently come up with a magic strain of bacteria that converts cellulose (the dominant organic component of grass clippings) into glucose.

4. If a scientist is observing biotic and abiotic factors, which of the following level of organism must she be studying? A. An ecosystem B. A community C. A population D. An individual organism

What type of learning describes when animals learn by watching or listening to others of their species?

The process of grouping things based on their similarities is?

Why do you think more blood goes to some organs and not others?

Which of the following would most likely employ a forester? A. a state governments B. lumber businesses C. national govemments D. all of the above

How do environmental scientists use technology to track polar bears?