The proportions of a population that are at different age levels make up the population's a. fertility rate. c. age structure. b. growth rate. d. carrying capacity.

Diffusion, osmosis, active transport. All of these are methods by which a cell

To do this, they needed to acquire a very special internal organelle, called the chloroplast. Where did they acquire this internal organelle? (hint: it's the same place we got our mitochondria)

What describes a role of enzymes

An envelope is used by viruses to

If you have one lens of your microscope with 4X and the other with 10X, what is thr total magnification

Which of the following statements correctly relates mutations and survival rates of animals? Mutations always improve the chances of survival for an animal. Mutations sometimes improve the chances of survival for an animal.

Which derived character is shared by fish and frogs but not lancelets? A. hair B. four-legged locomotion C. amniotic eggs D. vertebral column

In what regions of the world is habitat loss most rapid?

Describe the process of speciation in relation to change in gene frequency, change in environment, natural selection, and genetic drift.

Which substance acts as a buffer in natural water? A) minerals and salt B) distilled water C) sulfuric acid D) a pH indicator