Answer:
Pitch is relative highness or lowness of sound.
Explanation:
The answer is energy i am pretty sure
Its nails (3rd one) im sure about it
Answer:
Endoplasmic reticulum
Explanation:
Endoplasmic reticulum is known to be a site where many cellular components are synthesized and also, it is found to be internal membrane of the eukaryotes. Thus, endoplasmic reticulum exists in two forms which include rough and smooth endoplasmic reticulum. Furthermore, it perform important role in the synthesis of lipids and modification of proteins.
Fusion is the joining of two or more things.
Fission is the splitting apart.
So really you read the question and look for the clues and you determine which one it could be.