Ferns and their relatives are vascular plants, meaning they have xylem and phloem tissues. Because of the presence of va..
This tutorial elaborates on the physical development of humans, particularly from puberty to adulthood. Read this tutori..
Regulation of Biological Systems tutorials are focused on the modulation of biological systems from cell to population l..
Hormones are essential in the regulation of the activity of the various biological systems of the human body. The ineffi..
According to Charles Darwin's theory of natural selection, preferable genes are favored by nature in the gene pool, and ..
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