Which of the following characteristics apply | vedclass

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(C) Penguins belong to the class $Aves$ (birds).$(P)$ Birds possess a digestive tract with a crop (for storage) and a gizzard (for grinding food). Thi

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$P, R$

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(C) Penguins belong to the class $Aves$ (birds).$(P)$ Birds possess a digestive tract with a crop (for storage) and a gizzard (for grinding food). This is a characteristic feature of $Aves$.$(Q)$ Birds exhibit internal fertilization,but they are oviparous (egg-laying),not viviparous. Thus,$(Q)$ is incorrect.$(R)$ Modern birds,including penguins,lack teeth. Their jaws are modified into a beak. This is correct.$(S)$ Birds have a closed circulatory system,not an open one. Thus,$(S)$ is incorrect.Therefore,the correct characteristics are $(P)$ and $(R)$.

Which of the following characteristics apply to penguins?
$(P)$ Presence of crop and gizzard
$(Q)$ Internal fertilization and viviparity
$(R)$ Absence of teeth
$(S)$ Open circulatory system

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Which of the following characteristics apply to penguins?$(P)$ Presence of crop and gizzard$(Q)$ Internal fertilization and viviparity$(R)$ Absence of teeth$(S)$ Open circulatory system