What period marine animals become extinct?

What period marine animals become extinct?
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The primary source of carbohydrates are – (1) Marine animals (2) Plants (3) Coal-tar (4) Crude oil

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The characteristics of Class Reptilia are (a) body covered with moist skin which is devoid of scales, the ear is represented by a tympanum, alimentary canal, urinary and reproductive tracts open into a common cloaca (b) fresh water animals with bony endoskeleton, air- bladder to regulate buoyancy (c) marine animals with cartilaginous endos- keleton, body covered with placoid scales (d) body covered with dry and cornified skin, scales over the body are epidermal, they do not have external ears.

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Last Answer : (d) body covered with dry and cornified skin, scales over the body are epidermal, they do not have external ears.