Answer:
D. the dynamic regulation of an organism's internal environment to maintain conditions suitable for survival.
Explanation:
Sister chromatids are two identical copies of Chromosome that is formed by the replication of a single chromosome.
This copies are formed during mitosis. Later on, these two sisters chromatids will grown into two different Cells
<span />
Any theory must contain a meaningful concept with new evolution to accept by the scientific community
Sun which produces sunlight
The answer is D. Chromosomes contain genes, and genes are made of DNA