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.
skeletal muscle found all over the body, attached to the skeleton.
variation due to the small differences in the genes that control each feature and characteristic...
the introduction of harmful substances (pollutants) into the environment.