When chromosomes are half way between poles what phase of the cell cycle is it?

Draw the structure of dna nucleotide with adenine as nitrogenous base

Q: a: in sexually reproducing animals, once fertilization of the egg takes place, the exists as a single cell until cell division begins

The picture represents a structure of the respiratory system. which is the function of this structure? to bring air into the body to exchange oxygen with carbon dioxide to carry air to the lungs to release oxygen from the body