Which statement is false?
a. populations with more genetic diversity are less likely to suffer from inbreeding.
b. selection pressures can change over time.
c. giraffes that stretch their necks more than other giraffes will have babies with longer necks.
d. natural selection acts on individual organisms.
e. adaptive traits allow individual organisms to better survive and reproduce.

c. Giraffes that stretch their necks more than other giraffes will have babies with longer necks.

Explanation:

Giraffes that stretch their necks will not have babies with longer necks. A trait only shows in next generation if it is genetically inherited i.e. the gametes carry the trait to the next generation.

When giraffes stretch their necks, they are modifying their actions in their life time which will have no effect on the gametes. Hence, this trait wont be passed to the next generation and babies will not have longer necks.

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.