Body organs first begin to form and function during the period of the ; within 6 months, during the period of the , organs are sufficiently functional to provide a good chance of surviving and thriving.

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explanation:

it takes hundreds of years to become stable.

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many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.