Biology Junction
Plant Structure and Function: Roots, Stems, and Leaves
Scientists found fossils of plants more than 420 million years old—but plants existed for up to 100 million years prior to these fossils. Learn about the importance of plants to the entire planet. Viewing a presentation helps scholars...
Curated OER
Anatomy of a Virus
This PowerPoint summarizes details about the virus from the structure and reproduction methods to the different modes of infection. Various viral diseases of animals and plants, viroids, prions and genetic origins of viruses are discussed.