CORE TOPIC 1
• Habitat: mostly aquatic, some are terrestrial
(moist soil)
• Body is soft, cylindrical and bilaterally
symmetrical
• Have a body cavity
• Level of organisation: Organ system level
• Body has ring-like compartments called
segments. These help in the movement of the
worm.
• Have special organs called Nephridia for
excretion.
Segmented body of the Earthworm
Leech is a parasite that attaches itself to the
body of the host and sucks blood