When selectively breeding animals why don't the offspring turn out exactly the way we want them to?

The genetics have millions of different combinations, there is also some inbreeding involved (which will cause birth defects) and the chances of getting exactly you want are very slim, kinda like winning the lottery.

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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.

i think its through the fallopian tube