I am pretty sure the answer is D (combination)
Birth control pills contain mam-made forms of two hormones called Estrogen and Progestin. Both hormones prevent a woman's ovary from releasing an egg during her menstrual cycle. They do this by changing the levels of the natural hormones the body makes.
In photosynthesis, ATP is not needed. However, in aerobic respiration, ATP is required.
Answer:
Organs are structures made up of two or more tissues organized to carry out a particular function, and groups of organs with related functions make up the different organ systems.
Explanation:
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