<span>Ocean water conducts electrical current because it contains electrolytes. Electrolytes are good conductors of electricity, and are naturally present in appropriate amounts in bodies of water. However, pure water (without electrolytes or metals) is not a conductor of electricity. </span>
Answer:
Friction is a force that acts in a direction opposite to the motion of the moving object.
Friction will cause a moving object to slow down and finally stop.
Answer:
<u>A</u>
Explanation:
The heart cells must contract simultaneously to move blood.
This means that it needs to act fast and efficiently.
Therefore, the connections among heart cells are characterized by :
- having many branches
- having many communicating junctions
The correct option should be <u>A</u>
Answer: 117.8 nm
Explanation:
Given,
Nonreflective coating refractive index : n = 1.21
Index of refraction: 
= 1.52
Wave length of light = λ = 570 nm = 
Hence, the minimum thickness of the coating that will accomplish= 117.8 nm
