Question 8 of 10
2 points
why do adults have stem cells?
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a. they are left over from earlier development.
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b. they are responsible for maintenance and repair.
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c. they replace organs that are worn out.
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d. they continue the growth of the body.

Which term refers to the total dollar value of the goods and services produced in a country in a year?

What are charcteristics of lithosphere?

Molecular models of two different substances are shown below. in the molecule on the left, the oxygen atom pulls on electrons more strongly than the hydrogen atoms. in the molecule on the right, the two oxygen atoms pull on the shared electrons with the same strength. water molecule, h,o oxygen molecule, oz when the two substances are put in the same container, they do not attract each other. why does this happen? a. they both contain oxygen. b. one is polar and one is nonpolar. c . they are both polar. d. they contain different elements.