High levels of protein are detected in a cell culture. What can be concluded about the cells?

Explain how sequences of amino acids in proteins can be used to reveal relationships among organisms.

Which greenhouse gas is emitted when burn fossil fuels for energy? a. nitrogen b. oxygen c. carbon dioxide d. helium

Fossils of ancestors of the modern horses show a small 4-toed almost dog-like browsing animal named eohippus over time the horses got larger lost toes and changed to a grazing diet what is the best explanation of why this change occurred