The ___ are thin-walled blood vessels that exchange materials through their walls.

A. Arteries

B. Arterioles

C. Capilleries

D. Venules

As energy is transferred among organisms, some escapes from the environment as ___ energy

What is the primary visible color of an emission nebula? a. red due to ionized hydrogen atoms b. blue due to ionized helium atoms c. red because of reddening by dust d. black, because of dust e.

A pregnant client asks the nurse about the hormone that stimulates postpartum contractions. the nurse tells the client that the primary hormone that stimulates postpartum contractions is which?

What is the density if mass is 29.6 grams and volume is 12.1 cm3

Identify the characteristic of the transverse wave that halved from wave A (black) to wave B (green). A) amplitude B) crest C) trough D) wavelength

Which surface of the ocean current has the warmest water a. peru current b. north atlantic drift c. brazil current d. canary current

A forest habitat contains a great deal of plant and animal life. Using the forest habitat as a model, explain the difference between species richness and relative abundance. Discuss how each affects the survival and fitness of populations.

Sort the bones based on whether they belong to the appendicular skeleton or the axial skeleton.

Abnormally low levels of the neurotransmitter serotonin are associated with:

You are in a body of water where freshwater flows into the ocean. Which ecosystem is this?