What are Food Chains and Webs?

ISBN: 9780778776376

出版年: 2008-10

页数: 32

定价: $ 15.82

内容简介

This title contains a book & CD. Sunlight does not go very deep into water so seaweed must grow at the surface where its rays can reach them. Starting with the sun, food chains link together plants and animals in various ecosystems to help them survive. This CD has an approximate running time: 30 minutes.