1. Cool, clear night when the wind is calm
2.
3.
4.
What are the other three

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds

high growth (apex)

the answer u all are looking for is 4000000000000000000000 million years.