Answer:
B. Brain stem
Explanation:
The brain stem controls basic body functions such as breathing, swallowing, heart rate, blood pressure, consciousness, and whether one is awake or sleepy.
I believe the correct answer is c. obtain nutrient molecules
If there is only 1, x means female and y means male. If there are 3 I'd say 3 x's means female and 2 y's means male. And three x's is female and 3 y's is male. Hope that helps
