When scientists make predictions are they always right? If they are not what happens?

Why is excretion necessary to maintain homeostasis?

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.

What organ is the first to receive nutrients that have been absorbed from the digestive tract?