According to the theory of chemical evolution, what needed to happen first for life to evolve?

How does the carbon cycle involve an exchange of carbon

Describe your dna model. which part do the straws represent? the pushpins? the paper clips and the black dots you made with the marker?

Label the following as inner or outer planets; a) has 67 moons made mostly of hydrogen and helium b) has rings c)no moons, high volcanic activity d) known as the red planet, has 2 moons e) very thin atmosphere, moons or rings