Why is it important for scientists to develop a way to grow tissues that have a built-in system to supply blood? a lack of blood flow determines the number of cell layers that can survive when they are transplanted. a lack of blood flow determines the types of tissues that can be grown in culture. a lack of blood flow determines the amount of culture medium that is needed to keep a tissue alive. a lack of blood flow determines the amount of time a tissue can be kept alive in culture.

What field of science did harry hess study?

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.

Which represents the cross between parent plants if one is heterozygous for yellow-colored pods and the other is homozygous for green-colored pods? yy  ´    ´    ´    ´  yy