Because of the conditions necessary for their preservation, not all types of organisms that existed in the past have left fossils that can be __________.

Fossils are any remains or __________ of past organisms that have been preserved by nature.

Bones, shells, feathers, and leaves are just some of the things that can become __________.

Preserved remains can only become fossils if they reach an age of about __________ years.

Fossils can be divided into two categories, fossilized body parts (bones, claws, teeth, skin, embryos, etc.) and fossilized __________, (which are footprints, nests, dung, tooth marks, etc.), all of which provide valuable clues about Earth’s past.

Which type of fossils can tell you about the movements and behaviors of organisms?

This is the most common type of fossil people think of when they think about a fossil and this process typically preserves teeth, bones, shells, and wood.

Natural casts form when flowing water removes all of the original bone or tissue, leaving just an impression in sediment. Minerals fill in the __________, recreating the original shape of the organism very common for marine organisms with shells.

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What kind of fossil is this?

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How did this fossil form?

In order for a fossil to form, the organism's remains must not be significantly disturbed by a scavenger, rotted away by decomposers like bacteria, or destroyed by natural forces such as weathering which are all very __________.

Which of the following is a factor that limits fossilization?

Which of the following environmental conditions would favor fossil formation?

Which will LEAST likely form a fossil?

Which of the following BEST explains why most living things do not become fossils?

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How was this dinosaur fossil most likely fossilized?

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