Why was the development of proto-amphibians so significant to life on early earth?
A. We’re the first organisms with bilateral symmetry
B. We’re the first organisms to reproduce sexually
C. We’re the first organisms not confined to a water environment
D. Contributed huge amounts of oxygen to the atmosphere

C

Explanation:

Proto-amphibians were not confined to water like their ancestors were.

he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

i hope this : )