The invention of the plow and the sickle made more productive. farming
hunting
sailing

Farming

Explanation:

A plow and sickle are used to prepare and later harvest land and crops. This made farming much easier and more efficient. They had no direct effect on hunting or sailing.

the language of nature was a manifestation from god as he said "let there be light" and there was light the world began to assume visible, comprehensible form.

what ever we know now think of the old vision of creation we can be sure that with out the speaking of word -without language- we would have no science today with its striking power to illuminate the world.

answer; a cost benefit analysis;