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:
carbondioxide last in about 300 to a 1000 years in the atmosphere
Answer:
b to help organize data and record info.
I'm sure it's Quarts, the answer would be D
