The red liquid that circulates in the arteries and veins of humans and other vertebrate animals, carrying oxygen to and carbon dioxide from the tissues of the body.
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As powerful as diffusion is, cells sometimes must move materials in the opposite direction—against a concentration difference. This is accomplished by a process known as active transport. As its name implies, active transport requires energy.
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This is possible by having different stem cells for different types of cells which then have different genes activated to make cells different
Yes, those that use external fertilization are more likely to produce large numbers of sperm and eggs.
