How many options should every branch in a dichotomous key have?

Leaf S (3RD LEAF)

The largest grouping of organisms is ____________________ and the smallest is _________________________________.

What is a dichotomous key?

Identify leaf F

A student discovers an arachnid with a segmented abdomen, long legs, and a tail with no stinger.

The student uses the dichotomous key below to identify it.

1. a) Abdomen segmented.............go to 2

b) Abdomen not segmented ......go to 4

2. a) Abdomen with tail....................go to 3

b) Abdomen without tail...............go to 5

3. a) Tail with stinger..........................Scorpion

b) Tail without stinger.....................Whip scorpion

4. a) Legs longer than body.............Daddy Long Legs

b) Legs not longer than body……….Wind scorpion

5. a) Covered with spines .......................Mite

b) Few spines.....................................Tick

Which leaf is shown in the drawing?

According to key above, which animal has wings covered by an exoskeleton and a round body?