Answer:
The correct anwser is D. Signals inside the spinal cord
Explanation:
hope this helps :)
Answer:Mercury, Venus, Earth, and Mars
Explanation:
I think its C. hormones act on muscles and glands only. Because hormones act on cells, tissues, organs etc. So this is incorrect and the rest of them are correct.
It provides an objective, standardized approach to conducting experiments and, in doing so, improves their results. By using a standardized approach in their investigations, scientists can feel confident that they will stick to the facts and limit the influence of personal, preconceived notions.
