I believe the blank is "mass."
Answer:
I think the answer is A
Explanation:
D is pointing at specifically at electron which is the outer charger of the electron cloud. I don't think its likely to be D as the answer.
Answer;
Mendel's work was not well known until many years after Darwin published his theory of evolution
Explanation;
-Mendel's work was ignored because it was not widely distributed, and he didn't make an effort to promote himself. In actual fact, the reasons are more complex.
-Gregor Mendel had the answer to Darwin's problem. Traits were not blended, but inherited whole. And according to Mendel's laws of inheritance, a trait that might disappear in one generation might reappear in the following generation. Modern Neo-Darwinism combines both Darwin's and Mendel's work.
"Protein" helps in packaging of DNA<span> in eukaryotic chromosomes
Hope this helps!</span>