Glossary: Z
zoogeography
zoogeographic
The study of differences in animal distribution across geographic regions. Often integrates a variety of disciplines, such as ecology, physiology, phylogenetics, paleontology, geology and biogeography.
zooplankton
small animals that float or drift in great numbers in fresh or salt water, especially at or near the surface. These serve as food for many larger organisms. (Compare to phytoplankton.)
zygote
a cell formed by the fusion of two gametes, usually a sperm and egg cell. The zygote refers specifically to a fertilized egg before cleavage begins.
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