UnScramble this Word: e n d s i w d?

Questions

Cold-blooded aquatic animals with backbones, gills, & fins are called_________?

Collective term for slender, threadlike outgrowths of the epidermis of mammals, forming the characteristic covering of those mammals?

Colorless chemical pesticide, dichlorodiphenyltrichloroethane, used to eradicate disease-carrying & crop-eating insects?

Colorless, odorless, sweet-tasting alcohol, c3h8o3, with a specific gravity of 1.26?

Commercial enterprise of hunting whales to obtain oil, whalebone, meat, & various by-products?