What repair enzyme/mechanism is responsible for cutting out errors in the dna

According to the cladogram, which organisms have roundworms as a common ancestor?

The table above shows five different types of chromosomal abnormalities that can occur during meiosis. they result in either an individual having too many or too few chromosomes in their genome. what is the most likely cause of these chromosomal abnormalities?

Which body region are part of the cephalic region?