Answer:
Stem cells provide new cells for the body as it grows, and replace specialised cells that are damaged or lost. They have two unique properties that enable them to do this: They can divide over and over again to produce new cells. As they divide, they can change into the other types of cell that make up the body.
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Answer: The female had the genotype XHXh, and produced the two gametes seen at the left side of the diagram. The male had the genotype XHY0, and produced the two gametes seen at the right side of the diagram.
Explanation:
Answer:
all
Explanation:
represents an observation is fact
offers an explanation is theory
defines a relationship is laws
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In the nervous system a synapse is a structure that permits a neuron or nerve cell to pass an electrical or chemical signal to another neuron or to the target effector cell
