Which is common between earthworm, leech and centipede?
They have Malphigian tubules
They are hermaphrodite
They have ventral nerve cord
None of the above
Eustachian canal connects
middle ear with external ear
middle ear with internal ear
external ear with internal ear
pharynx with middle ear
A.
middle ear with external ear
The fucntion of Eustachian tube is to equalise air pressure on both (external and middle ear) the sides of tympanic membrane. Thus, it connects middle ear with external ear.
Bacteria are considered plant because they
are green in colour
have rigid cell wall
have chlorophyll
have stomata