Autism is a neurological disorder thought to be caused by mutant alleles of one or more genes in an individual. scientists had been wondering why the number of children diagnosed as autistic has increased dramatically in the last decade, from 1 in 500 in 2002, to 1 in 88 in 2012. researchers now think that they might have found at least part of the men are fathering children at later and later ages. a paper published in the journal nature in 2012 showed a correlation between paternal age and the incidence of autism; the age of the mother was not a factor. how does this observation provide a possible explanation for the apparent increase in the rate of autism?

they each offer a fresh glut of resources to the organisms that can arrive and exploit them. as individuals and new species continue to appear, they actively and passively alter the environment. competition for shared resources increases, local abiotic and biotic conditions shift, and the relative abundances of species change accordingly. the process is called ecological succession, and it is one of the earliest and most well-known concepts in ecology.

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as the gila monster consumes the eggs or young of the desert cottontail and gambel's quail, thus its main food supply is only accessible for a restricted time duration every year. however, for this, the gila monsters exhibit three adaptations, which elevate their survival rate in the desert condition.  

first, is that they possess huge bodies, and can consume greater concentrations of food during a small period. secondly, they require to feed infrequently as they can accumulate fat in their tails. ultimately, their rate of metabolism is very low, so that they can burn their reservoirs of fat gradually.