The basic units of structure in all living organisms are the what? Is it organelles, chromosomes, or cells.

Radiation burns, which cause delayed, irreversible changes of the skin, can be caused by high doses of what form of ionizing radiation?

A marine biologist wants to investigate the effect of ocean tides on certain aquatic ecosystems. Can this be studied by the scientific method?

Explain what is mutatation?

A series circuit is one that: A. must have only one resistor. B. has just one path for current to flow. C. provides no resistance to current. D. can have current flowing in more than one circuit branch.

Many traits, such as stem length in plants and skin color and height in humans, are controlled by two or more genes. What is this called?

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