B. The nervous system collects and responds to information about the external and internal environment.
The answer is D has mitochondria and chloroplasts. In the leaf, so must have chloroplast, most eukaryotic cells have mitochondria (powerhouse of the cell)
C organs because molecules combine to form cells and organs combine to make organ systems
The large energy generated from the sun is generated from fusing 2 hydrogen atoms to form 1 helium atom at a time in the core of the sun. The fusion results to<span> large energy. Fusion of two hydrogen atoms results to helium since the atomic number of H is 1 and that of helium is 2. </span>
