Someone please help fast! What information can tree rings give us about past climates?

Select 2 correct answer(s)

A. Past temperatures

B. Past cataclysmic events like asteroid impacts

C. Past precipitation levels

D. Past atmospheric CO2

Are salt and soap nutrients or toxins for yeast? explain.

2. which is the last step in the scientific method?

In order to study genetic mutations, scientists must study genetic material. which statement describes the genetic material scientists are most likely studying? a) they study alleles that contain chromosomes, which are rna. b) they study alleles that contain genes, which are chromosomes. c) they study chromosomes that contain genes, which are dna segments.