Answer: an active virus has explicit symptoms that you know wich one it is and it is constantly waring out your body as a hidden virus is descreet and attacks randomly
Explanation:
The DNA is packaged... it starts by being wrapped around special protein molecules (histones). This forms a nucleosome.
Intelligence, it does not have any direct correlation with evolution and is not supported by factual evidence.
Answer:
Sperm-egg interaction
Explanation:
The formation of fertilization envelope is well-studied on the model system- sea urchin. It has been shown that, the fertilization envelope is formed after the initial sperm-egg interaction from the egg surface vitelline envelope and the paracrystalline protein fraction which is derived from cortical granules. Secretion from cortical granules, prevents polyspermy.
During mitosis the four centrioles appear visibly and move to the ends of the nucleus one pair at each end<span> then they produce a series of threads that attach to the chromosomes During cell division the threads split the chromosomes and drew them towards the centrioles</span>
