The Main Difference Between Respiration in Terrestrial Insects and in Terrestrial

The main difference between respiration in terrestrial insects and in terrestrial vertebrates is that _____.

A) insects rely on the blood in their circulatory system to deliver oxygen from the air to their tissues,whereas terrestrial vertebrates rely on their lungs to deliver oxygen in air to their tissues
B) insects rely on their tracheal system to deliver oxygen in air to their tissues,whereas terrestrial vertebrates rely on their lungs to deliver oxygen to their tissues through the blood in their circulatory system
C) insects have a lower metabolic rate than terrestrial vertebrates do,so they tend to rely more heavily on their circulatory system than their tracheal system for oxygen transport
D) insects use their tracheal system to transfer oxygen from air into blood,whereas terrestrial vertebrates use their lungs to transfer oxygen from air into blood

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