What did placoderms look like?

What are clouds made up of?

What are the three ecosystem trophic categories?

Salt marshes typically sit above the high tide mark true or false

During ligation, both hydrogen and covalent bonds form. which bonds form first? why do both types of bonds need to form?

There are three keys on a table. How might you use insight to determine which key opens a nearby door?

What do amoeba proteus, dinoflagellate, and euglena viridis have in common? a. they all can move and make their own food b. they all can move and use eye spot to locate food c. they all can move and be heterotrophic d.

How is a scientific hypothesis best evaluated?

The overall population of a species decreased. What could have occurred to make this happen? The immigration rate increased, while the death rate decreased. The birth rate decreased, while the death rate increased.

Which of the following terrestrial biomes cannot be found in the United States? A: temperature deciduous forest B: tundra C: desert D: grassland/prairie

Which of these food sources does the bald eagle not feed on? plants fish carrion mammals