This phylogenetic tree was constructed by comparing sequences for a homologous gene involved in development. select the correct statement. a. frog is the ancestor of both a mouse and a chicken. b. the common ancestor of a human and a frog and the common ancestor of a mouse and a chicken lived at the same time. c. the nucleotide sequence of this gene in a mouse is more similar to the sequence in a chicken, and both are less similar to the nucleotide sequence of this gene in a frog.

In the respiration-photosynthesis cycle shown above, what are the products of cellular respiration that belong in box 2?

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.

Methane gas created by a cows flatulence especially in a large herd is a greenhouse gas. true or false.