There are more hydrogen atoms in living organisms than any other atom, but oxygen is more abundant in terms of mass. why is this statement true? a) hydrogen is a gas, but oxygen is solid. b) hydrogen atoms have a lower mass than oxygen atoms. c) hydrogen is mostly in liquid form and oxygen is in solid form. d) hydrogen is present as single atoms and oxygen is bonded in compounds.

Compare the composition of the moon's surface with the composition of the earth's surface.

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.

If there are 350 trout found in 200 square feet of a pond measuring 1000 square feet what is the estimated trout population of the pond? a. 1350 b. 1550 c. 1750 d. 2000