I believe A is the answer, hope this helps. :)
please give brainliest.
They were completely heterophic in nature because it allowed them to absorb different material from the environment as an energy source
<span>The average heart rate is the number of heart beats counted in 15 seconds divided by 15 seconds. The instantaneous heart rate is the time it takes for a single heart beat. Since the heart can beat at varying rates, these values are not necessarily the same.</span>