What is a stem cell?

a. a cell from which a new cell that has a specialized function is formed.
b. a mature egg cell that is capable of forming a new organism.
c. a cell that has half the number of chromosomes of a parent cell.
d. a specialized cell in the skin that identifies pathogenic organisms.

the form of energy changes and the total energy increases0l

in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

explanation:

the sun's light combined with the visible wavelenghts form what is called ultraviolet radiation, which are the long waves at the end of a visible light sprectrum.

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bioteacher101