What is most likely the amount of energy available at a trophic level of tertiary consumers if the amount of energy available to secondary consumers in that food web is 200 kilocalories? 0 kilocalories
20 kilocalories
200 kilocalories
2,000 kilocalories

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.

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.

What is the role of dna ligase in the elongation of the lagging strand during dna replication?