How do type I muscle fibers differ from type II fibers in their respective oxidative capacities? What accounts for those differences?

Type I muscle fiber is also known as "slow twitch oxidative" fibers. Type I fibers are used in lower-intensity exercises such as very light resistance work aimed at muscular endurance and long-duration aerobic activities.

Type 2a muscle fibers are fast twitch, meaning they fire more quickly. They are also more powerful than type I fibers and are recruited for activities that require more intensity: sprinting, lifting heavy weights.

Type 1 muscle fibers are slow twitch and they use oxygen.

For type 2 there is type 2a which can use oxygen or glycogen, and there is type 2x which uses only glycogen. Type 2 is fast twitch muscle fibers.

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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.