The object's mass
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Earth is made out of a lot of different materials inclluding silicon, iron, nickel, aluminum and other metals. Of course, it's atmosphere is made out of gases including nitrogen oxygen CO2 and Carbon monoxide.
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This is usually because when they first became fossils, they embedded into the ground. Over many years afterwards, more layers came to cover that layer and so on. Newer fossils would be embedded into newer layers. That's why the older ones tend to be found the deeper you look.
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I dont know this so I looked this up, here is the results.
They are eukaryotic, which means they have a nucleus. Most have mitochondria. They can be parasites. They all prefer aquatic or moist environments.
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