You would not become so desperate when a drought occurred. It would be easier to farm if water was not such a necessity.
That is a good question. In mitosis, you don't get regular genetic variation but chance mutations can occur. In meiosis with fertilization, you get pairing of DNA from different hosts on a regular basis. I would choose the latter.
Variations in offspring are acted upon by natural selection: some offspring will be slightly more proficient at producing new offspring than others. This means that some alleles will promulgate throughout the population gene pool at a faster rate than others, resulting in a shifting frequency of incidence in the population gene pool. This is what evolution is: shifting allele frequencies in the population gene pool.
Answer: The late evolutionary professor of Palaeontology Stephen Jay Gould, proposed an evolutionary theory called 'punctuated equilibrium' to explain the evidence he found in the fossil record. His theory essentially meant that evolution proceeded by 'jumps' rather than gradually as Darwin proposed.The evidence was the fact (still the case today), that the many intermediate forms that are required by evolution to proceed in the standard Darwinian manner just do not exist. Gould once stated that 'The extreme rarity of transitional forms in the fossil record persists as the trade secret of paleontology. The evolutionary trees that adorn our textbooks have data only at the tips and nodes of their branches … in any local area, a species does not arise gradually by the gradual transformation of its ancestors; it appears all at once and "fully formed." (Stephen Jay Gould, Evolution's erratic pace, Natural History 86(5):14, May 1977.)The idea was that these 'jumps' occurred in small isolated populations which were thus not as likely to be fossilised. Thus Gould together with Niles Eldredge, explained the large, seemingly unbridgeable gaps in the fossil record, the study of which he was an expert.
The adaptive traits that arise through convergent evolution are called analogous. These are the same adaptive solutions that arise in different organisms facing very similar environmental challenges and having analogous mutations to come to similar traits through natural selection. Wings in birds, bats and insects are examples of this.
Francesco Redi
Speciation is the evolutionary process by which new biological species arise.
Biogeographic observations indeed suggest that a evolutionary process caused new species to arise, through the process we call natural selection. This is due to an animals adaptability in it's environment.
For those of you who accept the evolutionary explanations of biology, the reason why the human species, H. sapiens, arose in Africa, is that there was a series of other hominid species such as Australopithecus Afarensis who created the necessary evolutionary sequence. You might then ask why any hominids were in Africa, rather than some other continent. It is true that the forests of Africa are a suitable habitat for hominids, but the difference between Africa and South America, for example, is not that great. The appearance of hominids in Africa was essentially an accident of evolutionary history. Hominids did nothaveto arise in Africa, but they did.
There no advantages of one party rule. When other political parties are outlawed or new ones forbidden to arise, history has shown these situations to be disasters.
There a number of different advantages that arise when one decides to use Providian Visa such as secure transactions and balance updates whenever needed.
cladistic analysis identifies and considers only those charateristics of organisms that are evolutionary innovations cladistic analysis identifies and considers only those charateristics of organisms that are evolutionary innovations
mutations that arise in one group are not passed to the other group through reproduction
Different systems in the body of mammals work under the control and coordination of Nervous system of body. It is an evolutionary phenomenon which arise due to multicellularity in animals.
Cost-benefits analysis
Many problems can arise when moving to a new country, possible currency change, needing to adjust to a new culture, possibly overcoming a language barrier, ect.
Advantages: Just-in-time delivery lowers costs and increases efficiency by greatly reducing or eliminating the need for storage. Disadvantages: There can arise unexpected delivery hangups that cause a loss in sales.
Evolution