Which of the following are examples of insects?

• A. Ant and Grasshopper
• B. Spider and Scorpion
• C. Lobster and Crab
• D. Worm and Snail

Answer: (A)

Insects are hexapods with three body parts (head, thorax, abdomen) and six legs attached to the thorax. An ant and a grasshopper both have these features, so they are insects. They also have one pair of antennae, and many insects may have wings, though some lack them. Spiders and scorpions have eight legs and two main body segments, which places them in the arachnid group. Lobsters and crabs are crustaceans with various legs and different body organization, not matching the typical insect body plan. Worms and snails aren’t arthropods; worms are soft-bodied and usually lack an exoskeleton, while snails are mollusks with a muscular foot and often a shell.