Endocrine Signaling
Signals from distant cells are called endocrine signals; they originate from endocrine cells. In the body, many endocrine cells are located in endocrine glands, such as the thyroid gland, the hypothalamus, and the pituitary gland.
C) a system is a set of parts that function together as a whole
A is the answer. It’s like addition.
Explanation:
Sulfuric acid is represented by the formula H2SO4, which indicates two atoms of hydrogen, one of sulfur,and four of oxygen.
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Water, Sunlight energy, and CO2(carbon dioxide)
