Which compound features two hydrogen atoms and one oxygen atom, and is necessary for life?

Water

Ammonia

Amino acid

Phosphate

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

Blood has traveled from the heart to the toes. which describes the next step of the circulation process?

Why does meiosis produce cells with half the chromosomes? o a. most of the chromosomes are not necessary to keep an organism alive. b. a gamete needs only half the number of chromosomes because two gametes join together. o c. it makes the gametes easier to move around in the organism. o d. it is faster to produce gametes with fewer chromosomes.