If you have been stung while swimming in the ocean, you probably came in contact with a cnidarians: jellyfish platyhelminthes: flat worms nemotoda: round worms mollusca: mollusks annelida: segmented worms

One important development during the 3rd trimester that will insulate the infant against changes in temperature is a. the deposition of fat under the skin b. the closing of the septum between c. the atria of the heart d. the beginnings of lung functioning e. the beginnings of light and sound sensing