Answer: There is no question.
Explanation:
Due to no question I can simply not answer this. Pls mark me brianliest for answering correct.
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Me
Hi I'm in Chemistry too this year,
I believe D is correct because usually physical changes are things like density, color or quantity.
Neutrons and protons are in the nucleus
electrons are on shells which orbit the nucleus
Molecules of an ideal gas is composed of a large number of identical molecules moving in random directions, separated by distances that are large compared with their size.
Answer:
The bones of the skull and spinal column
Explanation:
The central nervous system is better protected than any other system or organ in the body. Its main line of defense is the bones of the skull and spinal column, which create a hard physical barrier to injury.
