What is first heart chamber to receive electrical signals and cause contraction

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 do you call the long folded tube inside the body attached to the stomach where nutrients in the food are absorbed?

An unknown liquid sample will flow at at rate of 3 ml/s through a funnel. you heat the liquid 10 degrees and it flows at a rate of 6 ml/s through the same funnel.