When two atoms<span> each need additional </span>electrons<span> to fill their valence shells, but neither is electro-negative enough to </span>steal electrons<span> from the other, they can form </span>another kind<span> of chemical </span>bond<span> called covalent </span>bonds<span>. In a covalent </span>bond<span>, two </span>atoms<span> move closer to share the </span>electrons<span>.</span>
The answer is C. In the ribosome, the protein synthesis and then transports to the endoplasmic reticulum for further transportation. For A, it often occurs in lysosome. For B, it occurs in mitochondria. For D, it occurs in cell nucleus.
C. Mammary gland. Hope this helps!
Answer:
The symbol for D in Brenda's diagram most likely represent the sun.
Reason:
A represents the Universe, B represents the Solar System, C represents the Earth and D represents the Sun