5. limb bones within unrelated animals that have the same basic structures are considered a. embryological. b. analogous structures. c. homologous structures. d. vestigial structures.

Connection compare and contrast genetic engineering to the process of natural selection. select all statements that are true.

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

What happens as electrons move along the chain of molecules known as the electron transport chain? they gain energy, which causes atp molecules to lose phosphate groups. they gain energy, which causes h *ions to join with oxygen to produce water. they lose energy, which is then used by the cell to make atp. they lose energy, which is then used to break down atp.