Answer:
, tree rings usually grow wider in warm, wet years and they are thinner in years when it is cold and dry.
Explanation:
I think it’s the second option. There is a ph scale attached below to explain this. Hope it helps.
Answer:
The new research suggests that Earth's water came from both rocky material, such as asteroids, and from the vast cloud of dust and gas remaining after the sun's formation, called the solar nebula.
Explanation:
Adenine pairs with Thymine with two hydrogen bonds and guanine pairs with cytosine with three hydrogen bonds.