What reasons do scientists give for saying that ciruses are not living organisms?

a. they cant reproduce without the aid of a host

b. they do not metabolize food in energy

c. they do not organize cells

d. all choices are correct

e. none of the choices are correct

How many chromosomes does each human cell contain? a. 23 chromosomes b. 26 chromosomes c. 43 chromosomes d. 46 chromosomes

This is a typical grassland food web. it is also a small picture of an important cycle on earth: the carbon cycle. describe how the carbon gets into this food web. a) bacteria and fungi, the decomposers, recycle carbon from dead organisms. b) carbon is found in the grass and is passed from one level to the next in this food web. eliminate c) all living things give off carbon dioxide as a by-product of respiration and it is released into the atmosphere. d) plants use carbon dioxide as a reactant in photosynthesis, to make usable chemical energy in the form of a sugar.

Aprocedure done under controlled conditions to test a hypothesis is an inquiry.