Definition: This is the copying process by which a cell duplicates its DNA.

It is DNA replication.

Explanation: DNA replication is a process by which a DNA molecule is copied into two identical daughter DNA. In this process, the double stranded DNA is unwound by the enzyme known as helicase and each of the two separate strands act as a template for the synthesis of a new strand. DNA polymerase is the enzyme that catalyzes the synthesis of a new DNA strand from a template strand. A template is a structure that allows molecules to be lined up in a specific order and joined to create a macromolecule with a unique sequence and function. Each of the new strands produced is complementary to the template strand. Complementary strands do not have the same base sequence or composition rather complementary means that wherever adenine is found in the template strand, thymine is found in the new strand and wherever guanine occurs in the template strand, cytosine is found in the new strand.

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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.

succession returns a disturbed

ecosystem to a more stable state. this is also classified into two (2) types:

primary succession and secondary succession. the primary succession arises when

a new land is transformed and a bare rock has been exposed providing an environment

that can be occupied for the first time. while, secondary succession occurs

when a previously occupied environment was disturbed that kills much of all its

community

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