1. Explain how an organism's habitat occupation relates to its tolerance range.
2. (a) Identify the range in the diagram above in which most of the species population is found. Explain why this is the case
(b) Describe the greatest constraints on an organism's growth and reproduction within this range:
3. Describe some probable stresses on an organism forced into a marginal habitat:

1 Explain how an organisms habitat occupation relates to its tolerance range 2 a Identify the range in the diagram above in which most of the species population class=