This biology question covers important biological concepts and processes. The step-by-step explanation below helps you understand the underlying mechanisms and reasoning.

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Here is the solution for question 6:
a) To construct a dichotomous key, we identify distinguishing features of the leaves (S, Q, R, O, P).
Dichotomous Key for Leaves
1a. Leaf is simple (one blade per petiole) ................................................................. Go to 2 1b. Leaf is compound (multiple leaflets per petiole) ..................................................... Go to 4
2a. Leaf margin is serrated ..................................................................................... S 2b. Leaf margin is smooth ...................................................................................... Go to 3
3a. Leaf is circular/round in shape ............................................................................ R 3b. Leaf is ovate in shape ....................................................................................... O
4a. Leaf has many leaflets arranged along a central stalk (pinnately compound) ................. Q 4b. Leaf has three leaflets ...................................................................................... P
b) Four characteristics of Class Insecta are: • Their body is divided into three distinct regions: head, thorax, and abdomen. • They possess three pairs of jointed legs (total of six legs) attached to the thorax. • They have one pair of antennae on their head. • Most insects possess one or two pairs of wings attached to the thorax.
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This biology question covers important biological concepts and processes. The step-by-step explanation below helps you understand the underlying mechanisms and reasoning.