Some agree its in the billions range somewhere close to 3 billion.
Answer:
Explanation:
ATCG are called the Nitrogenous Base. The DNA(deoxyribonucleic acid) is made up of a phosphate group, 5 Carbon sugar called deoxyribose and Nitrogenous base.
This Nitrogenous bases are further divided into purine and pyrimidine
Purine includes- Adenine and Guanine while pyrimidine includes Thymine and Cytosine or Uracil in the RNA.
When Base pair occurs, Adenine pairs with Thymine while Guanine pairs up with cytosine in DNA.
B. cellular respiration only
1. Fossil fuels are easy to find and we relied on them for many years
2. pollution and it kills many people
the third one i have not yet figured out sorry i hope this works.
