HELP PLEASE Which of the following is a good description of biological clocks?
a) A light-dark cycle of 24 hours during which entrainment takes place
b) External chemical systems that are regulated by time and control circadian rhythms c) None of these
d) Internal chemical systems that are regulated by nature and control parts of the body

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explanation:

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.

it should be briana that has it to me