Why do bones, shells, and teeth make up most of the fossils that have been found so far? because bones, shells, and teeth are easier to find
because most organisms have bones, shells, and teeth
because bacteria break down bones, shells, and teeth the fastest
because bones, shells, and teeth decay slower than other body parts

the last one

Explanation:

For an organism to become a fossil, it must not decompose or be eaten. ... When an organism is buried quickly, there is less decay and the better the chance for it to be preserved. The hard parts of organisms, such as bones, shells, and teeth have a better chance of becoming fossils than do softer parts.

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explanation:

plate tectonics and volcanic euptions

over time, plate tectonic processes cause continents to move to different positions on the globe.

for example, britain was near to the equator 300 million years ago, and therefore was hotter than it is today. for further details look at our climate through time poster or online map.

the movement of the plates also causes volcanoes and mountains to form and these too can contribute to a change in climate.

mountain ranges formed by plate tectonics. large mountain chains can influence the circulation of air around the globe, and consequently influence the climate.   warm air might be deflected somewhere cooler by the mountains.

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