The answer should be B because the central nervous system is the spinal cord and brain.
<span>The primary evidence that supports the theory that an asteroid strike approximately 65 million years ago caused a mass extinction is a thin layer of clay containing iridium, an element that is common in space, but not on earth being of that age and found in many different places in the world, indicating a large-scale event..</span>
<span>Mitosis cause an offspring to have the same DNA as it’s parents because</span> the last phase in Mitosis is Telephase, produces two diploid daughter cells, identical to the parent cell.
Enzymes are biological catalyst meaning they speed up reactions. They do this by lowering the activation energy which results in bond breaking much faster, leading to a quicker chemical reaction.
In conclusion, enzymes speed up a chemical reaction by lowering the activation energy, resulting in a faster rate of reaction as bonds break quicker.
Hope this helps even though its quite simplified! :)