Instructive theory
theory of antibody production, now considered untenable, in which antigen acted as template for the production of specific antibody as opposed to the clonal selection theory in which pre existing variation occurs and appropriate clones are selectively expanded.
Plants in lentic habitats have features not found in terrestrial plants. They acquired these features as they adapt to t..
Plants and animals need elements, such as nitrogen, phosphorus, potassium, and magnesium for proper growth and developme..
Ferns and their relatives are vascular plants, meaning they have xylem and phloem tissues. Because of the presence of va..
Homeostasis is essential to maintain conditions within the tolerable limits. Otherwise, the body will fail to function p..
Different pregnancy and birth control and contraception strategies are described. Read this tutorial to learn each of th..
Mammals are a diverse group of organisms, where most of them develop their offspring within the uterus of the mother. Ov..
