The three main worm phyla are flatworms, roundworms, and segmented worms. Roundworms have a digestive tube that has two openings. Segmented worms have a closed circulatory system in which blood is enclosed in blood vessels. These are important steps in the evolutionary development of animals.
Both it.) And I.) Can be answers. You could argue either one is right.
Bc they cut DNA in different shapes
Answer: Protons
Explanation: Protons and Nuetrons are found in the Nucleus of a atom
