Answer:
Early land animals had both lungs AND gills, and their bodies consisted of few hard parts. Meaning they lacked things like an exoskeleton for instance. Animals today have either lungs OR gills and many have protecting hard parts of their bodies.
Explanation:
Answer:
O Cells are all the same on the inside
Your going to need show us the experiment, sense all of those are functions there is no question or details for us to answer your question
