Answer:
Cardiac muscle cells must obey the all-or-none law of contraction
1 e
2 g
3 c
4 f
5 a
6 b
and 7 will be d
Answer:
c
Explanation:
because it's wrong and it will never be right in any absolute way
<span>A barter system is an old method of exchange. Th is system has been used for centuries and long before money was invented. People exchanged services and goods for other services and goods in return. ... The value of bartering items can be negotiated with the other party.</span>
