Answer: the system of blood, blood vessels and the heart that carries blood throughout the body
Explanation: i hope this helps
Answer:
XCl2(aq) + 2 AgNO3(aq) = 2 AgCl(s) + X(NO3)2(aq)
The element with 8 electrons in its 3d sublevel is Ni,
Nickel. The answer is letter D. The
rest of the choices do not answer the question above.
The correct answer is option 1. It should be noted that a catalyst does not lower or decrease the activation energy because instead it provides an alternative route for the reaction to proceed. This speeds up a chemical reaction without being changed.