A) would be the only correct one from my knowledge. Mutualism is when neither Organism is harmed and both live <em>mutually </em>together, and Parasitism is when an Organism is living on the, ex. nutrients, of the host.
Prokaryotes do not have a nucleus or any organelles. They are a single cell organism, such as bacteria and archaea
One dominant and one recessive for each parent is what you were asking for right ?
Carbon forms the key component for all known life on Earth. Carbon is the basis of all molecules. Its is easily able to bond because of the 4 valence electrons.
