Chapter 37.6, Problem 2MC

Summary Introduction

To explain:

The reason behind the production of smaller offspring by mollies in the light and non-toxic streams in comparison to the larger offspring by mollies in dark, toxic streams.

Concept introduction:

The life history traits are affected by the harsh environments. An ideal example for studying the life in a challenging environment is of Atlantic mollies (Poecilia mexicana). There are four different habitats for the mollies. The first kind of habitat is the light, non-toxic water second is light toxic water, third type of habitat is the dark non-toxic water and fourth type of habitat is dark, toxic water.