A dichotomous key is defined as a biological tool for identifying unknown organisms to a particular taxonomic level. It is constructed with many levels and series of couplets.
So, by observing the given dichotomous key, it is concluded that the correct answer is Option A- Organism X and Z have at least one observable trait in common in this dichotomous key.
Answer:
more carbon became present in Earth's soil, I think that but not sure
I would say communication, as neurons transmits messages from one part to another part of the body
Answers
1a
2a
3b
4a
Let me know if you want explanations :)