Question

1. categorize each statement as describing either insects or crustaceans.

exoskeleton fortified by calcium carbonate
spiracles and trachea for breathing
gills for breathing
6 legs
19 - 20 appendages
3 body segments (head, thorax, and abdomen)
2 body segments (cephalothorax and abdomen)
answer by dragging items here
crustaceans
answer by dragging items here
insects

Explanation:

• Crustaceans:
• Exoskeleton fortified by calcium carbonate: Crustaceans have a hard exoskeleton made of chitin often reinforced with calcium carbonate for protection.
• Gills for breathing: They respire using gills which are suitable for their aquatic or semi - aquatic habitats.
• 19 - 20 appendages: Crustaceans typically have a relatively large number of appendages which are used for various functions like feeding, locomotion, and reproduction.
• 2 body segments (cephalothorax and abdomen): Their body is divided into two main segments - the cephalothorax (a fusion of head and thorax) and the abdomen.
• Insects:
• Spiracles and trachea for breathing: Insects have a tracheal system. Air enters through spiracles (openings on the body) and is distributed via trachea to the cells.
• 6 legs: Insects are characterized by having three pairs of legs.
• 3 body segments (head, thorax, and abdomen): Their body is clearly divided into three distinct segments - head (for sensing and feeding), thorax (for locomotion as legs and wings are attached here in most cases), and abdomen (for digestion and reproduction).

Answer:

• Crustaceans: exoskeleton fortified by calcium carbonate, gills for breathing, 19 - 20 appendages, 2 body segments (cephalothorax and abdomen)
• Insects: spiracles and trachea for breathing, 6 legs, 3 body segments (head, thorax, and abdomen)