Answers

2014-09-09T20:03:32+05:30
1. Any group of population of an organism contains variations: not all members of group are identical.
2. Variations are passed from parent to offspring through heredity.
3. The natural over abundance of offspring lead to a constant struggle for survival in any population.
4.Individual organisms with variations that help them to survive and reproduce tend to live longer and to have more offspring than organisms with less useful features.
5. The offspring of survivors inherit the useful variations, and the same process happens with every new generation until the variation become common feature.
6. As the environment changes, the organism within the environment adopt and change to the new living conditions.
7. Over long period of time, each species of organism can accumulate so many changes that it become a new species, similar to but distinctly different from the original species.
8. All species on earth arise in this way.
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1. Any group of population of an organism contains variations: not all members of group are identical.
2. Variations are passed from parent to offspring through heredity.
3. The natural over abundance of offspring lead to a constant struggle for survival in any population.
4.Individual organisms with variations that help them to survive and reproduce tend to live longer and to have more offspring than organisms with less useful features.
thanks
2014-09-16T15:13:09+05:30
All the human beings are of single species with a common ancestor.as we know the human is first found in africa he homo sapiens.before past few 1000 years we all came from  africa.our genetic footprints can be tracted back to african roots.a couple of 1000years ago,some of our ancestors left africa while other stayed,as residents and spread across africa,the migrants slowly spread across africa towards west,eastand central asia,america,indonesiaand other countries.hence we can say that all human beings of different countries or continents are single species with a common ancestor. 
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