Write 2 biologists and what they did thats facinating

Probably the most famous naturalist of all time, Darwin's contribution to biology and society is beyond imagination. He established that all species of life have descended over time from common ancestors, the existence of new species occuring via the process of natural selection. His theory of evolution was published in On the Origin of Species in 1859 and it caused quite the stir – Darwin was disputing the longheld belief that all species had been created by God at the beginning of the world. Evolution by natuaral selection combined with Mendelian genetics is now accepted as the modern evolutionary synthesis and forms the foundations of much biological scientific endeavour. 

Mendel's extraordinary contribution didn't receive its just recognition until long after the friar's death – you could call him the Van Gogh of the biological world. Mendel used peas to discover and demonstrate the laws of genetic inheritance, coining the terms dominant and recessive genes in the process. The laws were rediscovered at the turn of the 20th century and provided the mechanism by which Darwin's theory of natural selection can occur. The two theories combine to form our current understanding of the evolutionary process.

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.

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