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Two common characters found in centipede, cockroach, and crab are -
A
Compound eyes and anal cerci
B
Jointed legs and chitinous exoskeleton
C
Green gland and tracheae
D
Book lungs and antennae
Detailed Solution
Centipede (class Chilopoda), cockroach (class Insecta) and crab (class Crustacea) all belong to the phylum Arthropoda.
The two characters shared by all arthropods are jointed appendages (the name arthropod means jointed legs) and a body covered by a chitinous exoskeleton.
Anal cerci are found in the cockroach but not in the crab.
Green glands are the excretory organs of crustaceans only, and tracheae are absent in the crab, which respires by gills.
Book lungs are found in arachnids such as scorpions and spiders, not in these three.
So the two common characters are jointed legs and a chitinous exoskeleton.
The two characters shared by all arthropods are jointed appendages (the name arthropod means jointed legs) and a body covered by a chitinous exoskeleton.
Anal cerci are found in the cockroach but not in the crab.
Green glands are the excretory organs of crustaceans only, and tracheae are absent in the crab, which respires by gills.
Book lungs are found in arachnids such as scorpions and spiders, not in these three.
So the two common characters are jointed legs and a chitinous exoskeleton.