Which structure of the heart acts like an automatic door that closes once blood enters a chamber and forces it to exit in the proper direction.

A.

atria

B.

valves

C.

arteries

D.

ventricles

What is the lining around the brain called?

What is the role of genes in evolution? a. Only genes can be acted on by natural selection. b. Parents with recessive genes die from overproduction. c. The genes of most surviving parents have only dominant alleles. d.

In what form do plants store their energy

Chemical structure makes up the cell membrane

A species of fly lives in a canyon. Some of the flies prefer the side that gets sunlight during the day, while others prefer the shade. Over time, they develop different mutations and start to mate with those that prefer the same conditions.

Snakes and worms have no legs and share a similar tube-like body structure. Describe how you could determine how closely related these two types of organisms are.

Which domain (s) include species whose cells have cell walls? A. Archaea B. Bacteria C. Archaea and Bacteria D. Archaea, Bacteria, and Eukarya

In birds, sex is determined by a ZW chromosome scheme. Males are ZZ and females are ZW. A recessive lethal allele that causes death of the embryo is sometimes present on the Z chromosome in pigeons.

Oxidative phosphorylation is the third step in cellular respiration. It is composed of two smaller steps (electron transport chain and chemiosmosis). What molecules are donating their energy to power the proteins in the ETC?

Wow was important for Mandel to study a large sample of pea plants