The uncertainty principle<span>, also known as </span>Heisenberg's uncertainty principle<span>, is any of a variety of mathematical inequalities asserting a fundamental limit to the precision with which certain pairs of physical properties of a particle, known as complementary variables</span>
Correct me if i'm wrong i think the best answer would be d. the cow uses all of the corn's energy for life processes.
I think that the answer is C.
Stem cells are what allow planaria to grow and regenerate as the stem cells can change into any of the cells that make up the planaria.
