<span>A species or group of species whose evolutionary relationships we seek to determine.
Hope this helps!</span>
What exactly is your question?
The decomposers are at the end of the food chain..
Explanation:
Because, decomposers are the last orgainsms that depends and decomposes all other organisma in the food chain..
This question seems like its too easy so i might have got it wrong.. but would't you just subtract 20 and 10 from 800 to get 770?
Answer - Well the basics and shared ancestry can be DNA & RNA as carriers of genetic info and also a universal code last be not least metabolic pathways. :)
