Which group of animals evolved first? a. echinoderms b. chordates c. flatworms d. cnidarians

D. cnidarians

Explanation:

on the evolutionary chart cnidarians (jellyfish) were the first singular self sustaining organisms the very first creatures on earth however are sponges which are a bunch microscopic organisms working together to make a "living creature"

glycolysis is a process that fuel your metabolism. it is apart of cellular respiration the process that produce atp.