XV. THE ECONOMIC IMPORTANCE OF ANIMALS

_Problems.--I. To determine the uses of animals._

_(a) Indirectly as food._

_(b) Directly as food._

_(c) As domesticated animals._

_(d) For clothing._

_(e) Other direct economic uses._

_(f) Destruction of harmful plants and animals._

_--II. To determine the harm done by animals._

_(a) Animals destructive to those used for food._

_(b) Animals harmful to crops and gardens._

_(c) Animals harmful to fruit and forest trees._

_(d) Animals destructive to stored food or clothing._

_(e) Animals indirectly or directly responsible for disease._

A Civic Biology, Presented in Problems · 第 111 / 178 题