Answer:
Researchers found that chronic exposure to a stress hormone causes modifications to DNA in the brains of mice, prompting changes in gene expression. The new finding provides clues into how chronic stress might affect human behavior.
FAT CAT ATE TER AT
the sentence does not make sense, it is an example of deletion mutation
the answer is a because if the model is based on experimental data it wont be good unless it has been tested.
Answer: Well really the digestive, respiratory and circulatory systems all work together to make cellular respiration possible so i guess you could choose a or b
Explanation:
