What does brianliest mean?

Iwill give brainiest to first person who gets it ! what are 3 basic types of interactions we see in an ecosystem?

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.

Long-period comets come from the oort cloud particles in earth’s atmosphere material from the asteroid belt the kuiper belt