What shows when organisms first appeared and the order they appeared in?

The earth consists of a variety of different organisms. despite their diversity, however, some similarities on the structural and metabolic levels may be seen. these similarities can be attributed to a. similarities among organisms in their proteins and nucleic acids. b. the ability of organisms to readily adapt to sudden environmental changes. c. similarities in organisms' habitats and niches. d. the ability of all organisms to interbreed and produce new species.

2. given that most biochemical (other than coal) rocks react with hydrochloric acid, what does that tell you about organisms?

What sre the effects of hemolytic disease of a newborn