B mass number because it can be observed with out changing the element
Answer:
cell membrane
Explanation:
it controls what comes and goes out of a cell
Experiments with cathode ray tubes led to the discovery of the electron (electrons).
Or I think the t.v
Answer:
109.5°
Explanation:
Pls Cross Check It, If It Correct
None. Both chlorines and both hydrogens are single-bonded to the central carbon atom; the molecule is comprised of four single bonds and no double bonds.
Hope this helps!
