<span> A huge meteor struck the earth and caused the chemicals to change.</span>
Of these options, I'd say the third choice or "Many species of organisms that lived long ago are now extinct". I hope this helps :)
Answer:
An EL mechanism
Explanation:
I looked this up, it's called an EL mechanism
Au :)
Pb + Cu(2+)---> Pb(2+) + Cu
Mg + Cu(2+)---> Mg(2+) + Cu
2Na + Cu(2+) ---> 2Na(+) + Cu
Au + Cu(2+) ---> (this reaction is not possible)
The appropriate answer is B. Has no atmosphere. Neptune is a gas giant and is the eight planet in the solar system. It has a thick atmosphere consisting of hydrogen, helium and methane. Neptune has at least eight moons with Triton being the largest.
Neptune has four rings which circle the planet. The rings are made of dust particles, similar to the rings of Saturn.
