Heat energy drives earth systems. what are two sources of that heat?
a. the sun and heat left over from the formation of the earth
b. trade winds and heat left over from the formation of the earth
c. chemical reactions in the atmosphere and fission
d. the sun and fission

What are genotypes? what are phenotypes?

What enzyme is most important for dna replication and why?

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.