EVOLUTION
SOURCES OF VARIATION IN A POPULATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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mold
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cast
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petrified fossil
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trace fossil
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Detailed explanation-1: -A cast is a hollow area in sediment in the shape of an organism.
Detailed explanation-2: -A cast is a solid copy of the shape of an organism. Petrified fossils are fossils in which minerals replace all or part of an organism. Another type of fossil is a carbon film, an extremely thick coating found on rock.
Detailed explanation-3: -Sometimes when an animal dies and its body decays, it can leave an imprint in the sediment. If this imprint fills in with minerals from sediment and groundwater, it can harden to form a fossil. This fossil is called a cast fossil. The fossilized imprint is called a mold fossil.
Detailed explanation-4: -Answer and Explanation: An example of a mold fossil would be a shell pattern that appears in a rock after a crustacean dies and is buried in mud. Over time, the organic parts of the crustacean and its shell might decay, however, the imprint of the shell on the rock is preserved through millions of years.