Involuntary muscle contraction, such as those in the pupil of the eye, digestive tract, and diaphragm are the responsibility of the

a cerebrum
b medulla oblongata
c cerebellum
d spinal cord

Cerebrum controls the higher brain function such as speech, writing, etc. The cerebellum controls the involuntary stuff such as your digestive track, breathing, etc.  The other 2 control a branch of other stuff. C is your answer.

lysosomes contain a variety of enzymes, enabling the cell to break down various biomolecules it engulfs, including peptides, nucleic acids, carbohydrates, and lipids (lysosomal lipase). the enzymes responsible for this hydrolysis require an acidic environment for optimal activity. hope i !

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explanation: bc blah