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Soils

Nutrients in the soil are essential to the proper growth of a land plant. This tutorial deals with the properties of soi..

Biological Energy
Biological Energy – ADP & ATP

ATP is the energy source that is typically used by an organism in its daily activities. The name is based on its structu..

Direct and indirect physiologic effects of growth hormone
Animal Growth Hormones

Hormones are produced in the endocrine glands of animals. The pituitary gland and hypothalamus are the most impor..

Lentic community
Freshwater Communities & Lentic Waters

Lentic or still water communities can vary greatly in appearance -- from a small temporary puddle to a large lake. The s..

Gene Regulation in Eukaryotes
Gene Regulation in Eukaryotes

This tutorial is about genetic regulation in eukaryotes. Learn about the general structure of a eukaryotic gene, the tra..

Adaptive Radiation
Adaptive Radiation

The diversification of several new species from a recent ancestral source, each adapted to utilize or occupy a vacant ad..