X hits on this document

91 views

0 shares

0 downloads

0 comments

20 / 25

Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display

FIGURE 7.6 Snail Selection

The shell of the snail Cepaea occurs in three color phases: brown, pink, and green. In different habitats-beech woodlands, meadows-different-colored shells are common or rare. In deciduous woodlands, the frequency of the color phases changes from spring to summer.

Document info
Document views91
Page views91
Page last viewedSun Jan 22 01:53:14 UTC 2017
Pages25
Paragraphs98
Words1439

Comments