Describe the structure of genetic material in terms of chromosomes, genes, alleles, and dna

Each chromosome contains a linear DNA molecule, closely associated with histone proteins. DNA is genetic material, made of only four different nucleotides arranged in a double helix. ... Hence, several genes are located on same chromosome. Homologous chromosomes carry same genes, generally in same order.

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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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