In numbers of

Insects
Insects are animals that have six legs, three body sections (a head, a thorax and an abdomen), antennae and a hard exoskeleton, like a skeleton on the outside of their body – they are invertebrates. Vertebrates like mammals have a skeleton on the inside of their body. Insects are the most diverse group of animals on the planet, meaning that they have the largest number of species.
Insects lay eggs, which hatch to produce a larva. These larvae shed their exoskeleton several times until they reach adulthood. Some insects change slightly between each moult and are called nymphs during the process, for example, cockroaches and water boatmen, while some undergo a massive change in their final moult, like butterflies, which have an extra pupa phase. An insect that is not an adult or not mature is broadly called a juvenile.
In numbers of species and individuals and in adaptability and wide distribution, insects are perhaps the most eminently successful group of all animals. They dominate the present-day land fauna with about 1 million described species. This represents about three-fourths of all described animal species. Entomologists estimate the actual number of living insect species could be as high as 5 million to 10 million.

Vocabulary:
Hexapoda – Шестиногие
Vertebrates – Позвоночное животное
thorax – грудная клетка
abdomen – брюшная полость
excretory – выделительный

Questions:

1. What is an insect?
2. What does it consist of?
3. Choose one of the insects and describe it.