AP BIOLOGY

Detailed explanation-1: -Arthropods form the phylum Arthropoda. They are distinguished by their jointed limbs and cuticle made of chitin, often mineralised with calcium carbonate. The arthropod body plan consists of segments, each with a pair of appendages. Arthropods are bilaterally symmetrical and their body possesses an external skeleton.

Detailed explanation-2: -Identification of Insects and their Relatives: Insects are part of the phylum of animals called Arthropoda. All arthropods posses an exoskeleton, bi-lateral symmetry, jointed appendages, segmented bodies, and specialized appendages.

Detailed explanation-3: -One character inherited by all arthropods is bilateral symmetry.

Detailed explanation-4: -Characteristic features of Phylum Arthropoda The body structure shows bilateral symmetry. They are triploblastic. They can be found in all types of habitats – land, water and soil.

Detailed explanation-5: -The exoskeleton is composed of a thin, outer protein layer, the epicuticle, and a thick, inner, chitin–protein layer, the procuticle. In most terrestrial arthropods, such as insects and spiders, the epicuticle contains waxes that aid in reducing evaporative water loss.