Which of the following statements explain why red blood cells
(rbcs) are highly specialized for oxygen transport?
(1) rbcs contain hemoglobin.
(2) rbcs lack a nucleus.
(3) rbcs have many mitochondria and thus generate atp aerobically.
(4) the biconcave shape of rbcs provides a large surface area for the inward and outward diffusion of gas molecules.
(5) rbcs can carry up to four oxygen molecules for each hemoglobin molecule.

(a) 1, 2, 3, and 5 (b) 1, 2, 4, and 5 (c) 2, 3, 4, and 5

(d) 1,3, and 5 (e) 2, 4, and 5

blah

explanation:

bc blah

as the gila monster consumes the eggs or young of the desert cottontail and gambel's quail, thus its main food supply is only accessible for a restricted time duration every year. however, for this, the gila monsters exhibit three adaptations, which elevate their survival rate in the desert condition.  

first, is that they possess huge bodies, and can consume greater concentrations of food during a small period. secondly, they require to feed infrequently as they can accumulate fat in their tails. ultimately, their rate of metabolism is very low, so that they can burn their reservoirs of fat gradually.