Which are sources of adult stem cells? check all that apply. bone marrow amniotic fluid brain  gametes liver embryo

The correct answers are "bone marrow", "brain" and "liver".

Explanation:

Adult stem cells are cells that are on an adult body and are able to differentiate into different kinds of adult cells in order to replace them when is necessary. The bone marrow, the brain and the liver are three examples of sources for adult stem cells. Once any of these organs suffers a damage that causes a cells' lost, the adult stem cells differentiate into the cells that are needed to replace them as far as possible.

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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.