Chordates are animals that possess certain characteristics including a notochord. Humans fall into this category along with many vertebrates such as whales, falcons etc; therefore, all of the answers apply.
Food, research, therapy, entertainment affection.
Answer: The nucleolus produces and assembles cell's ribosomes.
Extra:
Ribosomes are transported to the cell’s cytoplasm to where they serve as the site for protein synthesis.
It is C, because DNA has 2 pairs: a t and c g.
When translated into RNA, a pairs with u instead.