Misc: Botany & zoology combined make up the science of _______.?

Questions

The conception and birth of the armadillo are odd events. Although mating usually occurs in July, the embryos of the armadillo remain in a dormant state until November. Later in March, four young are born. Armadillos are the only mammals in which multiple young form from a single egg with any regularity. All four of the young, always of the same sex, are identical quadruplets and developed from the same egg. They even shared a single ---------- while in the womb.?

---------- can swim for a 1/2 mile without resting, and they can tread water for 3 days straight.?

It seems to biologists that, unlike their humpback whale relatives whose underwater song evolves from year to year, killer whales retain individual ---------- unchanged over long periods, possibly even for life.?

There are 690 known species of ----------?

The massive skeleton of the African ---------- accounts for about 15 percent of the body weight, just as in a man of slender build; however, the elephant's skeleton supports as much as four tons per leg, and is thus stressed close to the physical limit for bone. To keep from damaging its skeleton, an African ---------- has to move sedately, never jumping or running. The "charge" of these animals is a fast walk on long legs, at about 15 miles per hour.?