When it is said that mutation is the ultimate source of genetic variation it means that it creates several new combinations which is similar to meiosis and fertilization because <span> new alleles and genes appear. It is just about some common points.</span>
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Voluntary muscles mean under conscious control and skeletal muscle is consciously controlled, unlike involuntary muscle, the ly are controlled by the autonomic nervous system.
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I think its chemical energy is not required because passive transport doesn't need energy at all
