Homologous structures among major groups of organisms may differ in_____  a. size c. function b. shape d. all of the above

The traditional organization of the animal family tree of classification is based mostly ona. DNA sequences.b. protein structure.c. conserved anatomical characteristics.d. ribosome structure.

18)

Life first appeared on Earth ___________ of years ago.Choose one:   A.  billions B.  hundreds of thousands C.  thousands D.  millions

Organisms A, B, and C are all in the same family.  Organisms B and C are in the same genus. Given that information, select all the true statements about the relationships among these organisms. Group of answer choices organisms A, B, and C are in the same domain organisms A, B, and C are in the same phylum organisms A, B, and C are in the same order organism C is more related to A than to B organisms A, B, and C are in the same species organism B is more related to C than to A

15) This is an artist's rendition of Tiktaalik. What features does the organism possess and what does that provide evidence for with respect to evolution?