Which picture represents a cast?

Molds and casts are three-dimensional impressions in which the surface contours of an organism are preserved. Organisms buried in sediment slowly decompose, leaving a cavity that contains an exact imprint of the organisms’ shape and size. When this hollow space fills with material, this material takes the shape of the mold, forming a cast. Although the fossil may exhibit characteristics of the original organism, normally no organic material remains.

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Brainliest?

do u have any answer choices?

2. a land bridge connected asia and north america thousands of years ago.

4. crossing the land bridge would have been simple for the first migrants.

5. people might have crossed a land bridge while hunting animals.