Struggling with your prescribed literature?
Our Literature Study Guides provide insights and analysis of themes and characters and includes guidelines for writing your exam.
biological classification group (taxon) for animals that is divided into classes. The plural of phylum is phyla.
animals with three cellular body wall layers: the ectoderm, mesoderm and endoderm.
a naturally occurring sequence of organisms from the various trophic levels that feed on each...
the spontaneous movement of molecules, atoms or ions, from an area of higher concentration to an...