A(n) key is very easy to use because it provides only two choices.

Dichotomous key

Explanation:

A dichotomous key is a system that classifies or separates something into different groups. This is done by answering questions about two options, one of the answers opens to two more options and without sequence the process is repeated until the final rating is reached. This system is mainly used in the classification of living beings, facilitating the organization of information!

a axis of a graph is a color or shade so we can all go outside and have a party so we can eat   some grilled cheese sammiches and broccoli and have some ugly fun times

i don't know why i put this, i know its not the i was just bored : p

delete this answer while you can