Answer:
Organic molecules produced from spontaneous synthesis or from meteorites
Explanation:
While she is still resting, take her resting heart rate first before you can calculate her target heart rate.
The answer to the question stated above is letter b. <span> <span>a meteor or asteroid colliding with Earth
</span></span> <span>The mass extinction at the end of the Mesozoic Era was caused by </span>a meteor or asteroid colliding with Earth. This was said to happen about 65 million years ago.
The third option, destroying cells