plz halp xc

What is a system of classification that uses yes/no questions about the
observable physical characteristics of an organism in order to classify it?
A) dichotomous keys
B) trichotomous maps
C) unochotomous keys
D) pentachotomous maps

Which of these questions would be the MOST appropriate at a decision point on a dichotomous key?
A.) Can the animal see?
B.) Can the animal swim?
C.) How big is the animal?
D.) Does the animal have legs?

Which of these questions would be the MOST appropiate at a decision point on a dichotomous key?
A.) Can the animal run?
B.) Does the plant have flowers?
C.) What shape are the tree's leaves?
D.) How many legs does the animal have?​