The answer is option A hope it helps!
I'm not quite sure what you mean by which sphere, but I found that the most abundant gas on earth is nitrogen at 78%. Hope this helps
Answer:
Answer is D.
Explanation:
The first cleavage division can be explained or described as the series of first cellular division of the zygote after fertilization.
In this case, the process of recoiling of the shell of the snail can not be categorized as one of the examples at this stage.
