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Seed plants are vascular plants. They differ from the other vascular plants in producing seeds that germinate into a new..

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A sensory system is a part of the nervous system consisting of sensory receptors that receive stimuli from the internal ..

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

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Chromosome Mutations

Mutations can also influence the phenotype of an organism. This tutorial looks at the effects of chromosomal mutations, ..

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This tutorial deals with the abiotic factors of the freshwater environment that determine what sort of life would be sui..

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Population Regulation in an Ecosystem

With regard to the population size of a species and what factors may affect them, two factors have been defined. They ar..