A(n) is a location in the model of an atom where the electrons are found.

Question 1 options:

Energy level or electron shell

Mass or weight

Proton or Neutron

Nucleus

preservation because he preserves part of the land and preserves means save

explanation:

after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

hope its .

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs