Which structures are parts of the central nervous system? select all that apply. the brain the heart the spinal cord the sensory neurons the bones the muscles

These are the parts of a central nervous system:

-The brain  

-The spinal cord

-The sensory neurons

Central nervous system is a system that controls all the functions takes place in our body. The brain is the central unit which sends signals to the body to perform a particular function. Brain receives a signal from body through sensory neuron and then sends back signal to the effector organ through motor neuron.

Other than this, motor neurons are also a part of central nervous system.

atp is used for energy.

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.