I think one is carbon dioxide not sure what the other is
Answer: Pretty sure (D) is the right answer.
Explanation: Plants consume water, carbon dioxide, and light from the sun to produce oxygen and to survive. The other options have the incorrect input which give it away, they also have wrong outputs that plants do not produce.
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.
The correct answer is: creative thinking.
Creative thinking means being able to consider and come up with something new. Creative thinking is a skill of an individual to perceive patterns that are not obvious and to solve problems in a new different way.