-There are different types of stem cells. There are adult stem cells and there are embryotic stem cells. Adult stem cells have some differentiation, they are more limitted but they can become more then one kind of cell. Embryotic stem cells are before differentiation. They can't be more then one kind of cell.
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Symmetry of segmented worms, round worms, and flat worms.
Each of these worms are bilaterally symmetrical. This means, each left and right side are equivalent to each other. Being bilaterally symmetrical helps with the movement of the animal. It gives a much stronger sense of direction. Animals that aren't bilaterally symmetrical e.g a jelly fish, when moving they don't have very strong control over their direction.
The different environments of segmented worms, round worms, and flat worms.
*segmented worms- They can live in most environments excpet frozen soil of the polar regions, and dry sand.
*round worms- Round worms live in fresh water and marine environments
*flat worms- flat worms live in fresh water environments
In this image, to the right, you see an example of bilateral symmetry. As you can see,having both equal sides, would definitely help your movement.
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