Answer:
part c I think I hope it is helpful to you
It could be due to hormonal imbalances, possibly stress related. However, if you're 20 years old and you have not had regular periods, see a gynaecologist or a GP. I'm confident they're able to provide more answers for you.
Answer: A gene is a section of a chromosome that contains instructions for building a protein.
Explanation:
A gene is the basic physical and functional unit of heredity. Some genes act as instructions to make molecules called proteins.
Yes, in a plant cell it contains chloroplast organelles that carry out photosynthesis and also contains a cell wall that keeps viruses and bacteria out of the cell.
Both animal and plant cells have a nucleus that acts as the brain of the cell.
They both contain cell membranes, mitochondria, ribosomes, rough and smooth endoplasmic reticulum, golgi bodies, lysosomes, and vacuoles.