1. Fig. 18.1 shows a drawing of a very small insect that feeds on the leaves of pine trees.

Fig. 18.1

Scientists can estimate the number of insects on a tree using capture-recapture.

First, they collect some insects from the tree.

Fig. 18.2 shows the equipment they use.

Fig. 18.2

Give the name of the equipment and explain how the scientists would use it to collect insects.

Name of equipment .............................

How it is used .............................