15 12 3 لا - 10 9 3 Question 19 (1 point) Listen The main difference between the earliest evolved tetrapods and the most recently evolved tetrapods is that later tetrapods produce milk to feed their young. early tetrapods have larger brains. early tetrapods lack a vertebral column. early tetrapods lack legs. Question 20 (1 point) Listen cally have
5 8 Z 12 15 18 1 9 21 3 6 Question 20 (1 point) 49 Listen Flatworms (Platyhelminthes) are and typically have all parasites; no digestive system Obilaterally symmetrical; a complete digestive tract with a mouth and anus radially symmetrical; no digestive system Obilaterally symmetrical; a gastrovascular cavity with one opening Question 21 (1 point) 4) Listen The invertebrate species that is the closest evolutionary relative to the vertebrates in the
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