Archaeopteryx was a a: mammal like reptile b: horse ancestor c: dinosaur d: early bird

How did the research presented in the article affect scientists' understanding of the evolution of eukaryotes

The fish shown above is a tarpon. it is a fast-swimming and powerful open-water fish. its closest relatives, oddly, are burrow-dwelling conger eels that stay on the bottom. both eels and tarpon developed from snake-like larvae that float in the plankton during the first stages of life. once they mature, tarpon and eels are not found near one another in the ocean. the tarpon and the eel illustrate all of the following except

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