Answer:
Explanation:
Red blood cells contain enormous amounts of a protein called hemoglobin. This iron-containing molecule binds oxygen as oxygen molecules enter blood vessels in the lungs. Hemoglobin is also responsible for the characteristic red color of blood.
DNA is replicated during the “S” phase (synthesis).
Answer:
D) Adenine, Guanine, Cytosine, and Uracil
Explanation:
RNA shares three of the nitrogenous bases of DNA: Adenine, Guanine, and Cytosine. However, instead of thymine, it has Uracil!
<span>they have fossils and pieces of the environment from the past inside of them</span>
Answer:
The answer should be C: mostly in the 20th century
Explanation: