All warm-blooded animals are incredibly helpless at first. Young birds and young bats must be taught to fly. Thousands of young seals and young sea lions are drowned every year. They never learn to swim "naturally"; the mother has to take them out under her flipper and show them how. Birds sing without instruction, but they do not sing well unless they have had an opportunity of hearing older and more adept members of their species. Older harvest mice build better nests than beginners. It is said that the young elephant does not seem to know at first what his trunk is for; it gets in his way and seems more of a hindrance than a help until his parents show him what to do with it. Insects, indeed, seem to start life completely equipped with all necessary reflexes, but even there the concept of "instinct" seems to require some modification, for they improve their talents with practice. Young spiders, for example, "begin by making quite primitive little webs, and only attain perfection in their art in course of time"; and older spiders, if deprived of their - spinnerets, will take to hunting.

[From Evans, B. (ed.) The Natural History of Nonsense. Alfred A. Knopf, Inc.]

Read the paragraph again and fill in the following columns in the manner shown here :