Which of these is the final result of secondadry succession? A : adaptation

B : rebuilt ecosystem

C : competition

D : final extinction

Which is an example of the practical pursuit of alchemy? a. forming perfect substances. b. transforming base metals. c. developing metalworking techniques. d. linking spiritual characteristics with material substances.

Do polar molecules have ionic bonds?

Which polymers are most closely related? a. protein and nucleic acids b. cellulose and starch c. nucleic acids and starch d. nucleic acids and cellulose