20. The answer is 1 (Precambrian)
21. The answer is 4 (Pennsylvanian)
22. The answer is 2 (Bony Fishes, Dinosaurs, and Mammals)
23. The answer is 2 (Reptiles)
Answer:
No viruses are not considered as living organisms, until they enter the body of the host
The color change is most likely due to the effect of "<span>(3) environmental conditions on gene expression" All these changes have to do with what will keep the fox alive for the longest amount of time. </span>
Answer:
The answer is A. Bacteria and Archaea
Explanation:
