Past Papers | GCE Guide
Aug 03, 2016 · Biology for IGCSE and O Level – 15 Living organisms and their environment 15(b) Describe the non-cyclical nature of energy flow Once energy is released by organisms it is lost and can be replaced only by further input, directly or indirectly, from the Sun. (W) 15(c) Define the following terms and establish the relationship of each in food ... ................
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