The answer is letter d. it has only 2 electrons in its first shell and 4 in the second shell. Basing from the electronic configuration of the carbon atom, the "s" orbital of carbon atom is completely filled leaving now the "p" orbitals partially filled. Thus in this case, carbon atom has four (4) valence electrons.
Answer:
Earth's upper atmosphere controls the radiation that escapes to space.
(please give brainliest)
Answer:
they are nursed by their mothers
Explanation:
A. The hosts body could reject the transplanted stem cells
