Answer:
Car, bat and rat belong to the class-Mammalia and have following common
features
(i) All have notochord at some
stage of their lifecycle.
(ii) All are warm-blooded
(iii) All have four-chambered heart.
(iv) All have skin covered with hair and have sweat and
oil glands.
(v) Body is divisible into head, neck, trunk and tail.
(vi) Females have milk producing mammary glands.
(vii) Fleshy external ear (penne) is present.
(viii) Respiration is through lungs only,
(ix) Excrete urea (ureotelic animals)
(x) Fertilization is internal.
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