sentences: a field is a kind of environment & an insect usually has a small size ->  an insect in a field is an example of a small thing in an environment  an insect in a field is an example of a small thing in an environment & observing small things in an environment is difficult ->  observing an insect in a field is difficult  observing an insect in a field is difficult & magnifying glass is used to see small things by making objects appear bigger ->  magnifying glass can be used to see an insect by making it appear bigger  magnifying glass can be used to see an insect by making it appear bigger & a hand lens is a kind of magnifying glass -> a hand lens can help seeing the insect by magnifying the insect