Which statements explain the gas exchange that happens at the alveoli? check all that apply.
**multiple answers**

a) carbon dioxide moves from the air in the alveoli to the blood.
b) carbon dioxide moves from the blood to the air in the alveoli.
c) the capillaries that surround the alveoli exchange both carbon dioxide and oxygen.
d) the capillaries that surround the alveoli exchange only oxygen.
e) oxygen is absorbed by the blood in the capillaries that surround the alveoli.
f) oxygen is the air we breathe out when we exhale.

Melting glaciers is a serious threat to the environment what is the possible consequence of melting glaciers on polar bears?

Which of the following is a consequence of urban heat islands? increased precipitation downwind of the city? increased precipitation upwind of the city? decreased winds within the city? increased winds within the city?

6. in domesticated cats, the following are independently assorting: normal ears (t) is dominant to tufted ears (t); curved whiskers (c) is dominant to straight whiskers (c); the presence of six toes (s) is dominant to five toes (s); gene for hair length is an x-linked codominant. the three phenotypes for hair length are long (xhxh), medium (xhxh), and short (xhxh); medium is the heterozygous condition. given two parents: ttccssxhxh x ttccssxhy how many different gametes could be formed in the female cat with respect to these four traits? how many phenotypes are possible in the offspring from this mating?