Fall Semester Test - 8th Grade Science

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What are the different types of fossils?

Back

The different types of fossils include mold fossils, cast fossils, trace fossils, true form fossils, and petrified fossils.

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What is competition in an ecosystem?

Back

Competition is when two or more individuals or populations try to use the same limited resources.

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Why do classification systems change over time?

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Classification systems change due to more sophisticated microscopes and increased knowledge of genetics.

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What likely caused the change in crab color distribution?

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A change in beach color made medium-tan crabs the most visible to predators.

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Why is the fossil record important?

Back

The fossil record provides evidence of past life and the changes in species over time, helping scientists understand the history of life on Earth.

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What is a mold fossil?

Back

A mold fossil is a type of fossil that forms when an organism leaves an impression in sediment.

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What is a cast fossil?

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A cast fossil is created when a mold fossil is filled with minerals that harden into rock.

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What are trace fossils?

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Trace fossils are evidence of the activity of organisms, such as footprints or burrows.

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What are true form fossils?

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True form fossils are actual remains of the organism, such as bones or shells.

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What are petrified fossils?

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Petrified fossils are formed when organic material is replaced by minerals, turning it into stone.