The excretory system allows animals to remove metabolic waste their bodies. Many of these substances are potentially toxic. in Mammals nitrogenous toxins like urea are expelled through liquid urine while in reptiles and birds the nitrogenous compounds are expelled as a solid. This allows birds and reptiles to use less water in the processes of metabolism.
Easier for diffusion to take place
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Your heart has to work more to pump blood through your body faster
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The term Hemichordata—from the Greek hemi, meaning “half,” and chorde, meaning “string,” thus, “half-chordate”—was first proposed because the buccal diverticulum, a tubular outgrowth from the mouth cavity forward into the proboscis, or “snout,” resembled a rudimentary notochord—the dorsal, o
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