Answer:
Autotrophs are organisms that prepare their own food through the process of photosynthesis, whereas heterotrophs are organisms that cannot prepare their own food and depend upon autotrophs for nutrition.
Explanation:
Btw I searched this up found it on a website called byjus.com. Hope this helps!
Matematically speaking, maybe because:
The number of substances = number of elements + number of different combinations of those elements
