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Institute of Human Anatomy
The Essential Ingredients of Semen
In this video, Jonathan from the Institute of Human Anatomy discusses the components of semen, why it is necessary for sperm cells and reproduction, and the glands that produce it such as the prostate gland.
Khan Academy
Natural Selection and the Owl Butterfly
The lecturer describes how specific characteristics develop. In this case, he discusses eye marking. The impact of environmental factors significantly influences the likelihood of successful reproduction, as favorable genes are more...