What was the first to appear in solar system

The sun

Explanation:

“Approximately 4.6 billion years ago, the solar system was a cloud of dust and gas known as a solar nebula. Gravity collapsed the material in on itself as it began to spin, forming the sun in the center of the nebula. With the rise of the sun, the remaining material began to clump together.“

b.

developed countries have tended to improve the environment, while developing countries have tended to damage it.