Given that acne relates to "oils" on marcus' skin, what accessory skin part do you think is most directly related to acne?

The accessory skin part that is most directly related to acne is sebaceous glands as this are considered to be an exocrine glands that are responsible of having to secrete substance such as waxy substances or oils in which is a contributing factor of having to produce acne.

an adaptation is a change or process by which an organism takes to be better suited for its environment. for example; migration is a behavioral adaptation, this is needed because birds are not built to last extremely cold climates. there are different adaptations because there are different species needing to adjust to different things, bears don't migrate; they hibernate.

explanation:

the universal gravitation equation. since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. if the mass of one of the objects is doubled, then the force of gravity between them is doubled.