a ladybug is a kind of insect & an insect usually has a small size ->  a ladybug is small in size  a ladybug is small in size & seeing small things with bare eyes is difficult ->  seeing a ladybug with bare eyes is difficult  seeing a ladybug with bare eyes is difficult & magnifying glass is used to see small things by making objects appear bigger ->  magnifying glass can be used to see a ladybug by making it appear bigger  magnifying glass can be used to see a ladybug by making it appear bigger & a hand lens is a kind of magnifying glass ->  a hand lens can help seeing the ladybug by magnifying the ladybug  a hand lens can help seeing the ladybug by magnifying the ladybug & counting something usually requires seeing that something -> a hand lens can help count the ladybugs