Unit 2 · Relation of classification of living beings and evolutionArthropoda, Mollusca and Echinodermata
Words of This Topic
- Arthropoda: the phylum of animals with a chitin exoskeleton and jointed legs
- Chitin: the tough substance that makes up an arthropod's exoskeleton
- Cephalothorax: the head and thorax fused into one part
- Compound eye: an eye made of many tiny units
- Antennae: a pair of feelers on an arthropod's head
- Trachea: the air tubes through which insects breathe
- Mollusca: the phylum of soft-bodied animals with a muscular foot
- Mantle: the fold that covers a mollusc's visceral mass
- Visceral mass: the part holding a mollusc's internal organs
- Pulmonary sac: the lung-like space with which land snails breathe
- Echinodermata: the phylum of spiny-skinned sea animals
- Calcareous: made of calcium carbonate
- Tube feet: the small tubes an echinoderm moves with
- Radial symmetry: body parts arranged evenly around a centre
- Regeneration: growing back a lost body part