What factors are necessary for natural selection to occur? O Changes that occur as an organism grows can be inherited, such as increased muscle mass from exercise.
O A population's changes over many generations happen to help the organisms evolve to be more advanced
O Adaptations are specific to the current environment, and may no longer be beneficial if the environment changes.
O Adaptations are used to help organisms evolve and reach perfection and are independent of environmental factors.

A because

A population's changes over many generations happen to help the organisms evolve to be more advanced

O Adaptations are specific to the current environment, and may no longer be

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.

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