(A) Trachea ()
(B) Spines (X)
(C) Secretion (X)
(D) Nervous system (X)
Answers: The entrance point for air in insects are known as Trachea.
(A) Trachea ()
(B) Spines (X)
(C) Secretion (X)
(D) Nervous system (X)
Answers: The entrance point for air in insects are known as Trachea.
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