The diagram below shows the layers of a rock having an ammonite: which statement about the rock fossils is true? fossil y is older than fossil x. fossil z is younger than fossil y. fossil z existed over many periods of time. fossil y existed during the same period as the ammonite.

Option (2)

Explanation: It is clear from the figure that the fossil Z appears to be at the top, fossil Y in the middle and fossil X at the bottom, and we know that the rocks appearing at the top is younger than the rocks that are present below. Thus it is applicable in terms of fossils too i.e the fossil Z is younger than the fossil Y.

Hence the correct option is (2)

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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.

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".