Which mechanism requires energy?

A. diffusion of oxygen into a red blood cell

B. diffusion of ions through a potassium channel

C. osmosis

D. exocytosis

How might a single hormone have drastically different effects in different cells? Propose several different mechanisms.

During the Carboniferous period, Virginia was equatorial and the warm seas supported abundant life and the deposition of lime sediments.

A rolling ball has an initial velocity of 5 meters per second. 30 seconds later, its velocity is 2 meters per second. What is the acceleration of the ball?

Evolution and speciation are the same process. True False

The difference in the concentration of a substance across a space is called a concentration ... ?

Explain the goals of a sustainable development.

When are to animals classified as belonging to the same species?

Process of biological change by which descendants come to differ from their ancestors

What types of cells would be produced by meiosis?

Gregor Mendel studied the inheritance of traits in pea plants. One trait he examined was the height of the plant. Pea plants with the dominant 'T' allele grew tall, and pea plants with the recessive allele 't' were short.