Has anyone got the time to proof read my biology essay for me. Heres a bit... Thx:)?

Question

During evolution different species lineages came into existence due to the presence of zygotic barriers. These zygotic barriers can be classed into two categories: prezygotic and postzygotic barriers. Prezygotic barriers are physical isolation, behavioural isolation, temporal isolation, and at the point of mating there is mechanical and gametic isolation. Postzygotic barriers are present after fertilisation and include reduced hybrid viability, reduced hybrid fertility and hybrid breakdown (Campbell & Reece, 2002). Generally hybrids are described as infertile, with the text book example being the mule which is a cross of a horse and a donkey where the two species have a chromosome number difference. This rule of infertile offspring between species as previously discussed does no hold true for all cases. Fitzpatrick & Shaffer (2007) compared the hybrid larvae in native California Tiger Salamanders (Ambystoma californiense) which are protected under the U.S. Endangered Species Act and in

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Answer 1

During evolution different species lineages came into existence due to the presence of zygotic barriers. These zygotic barriers can be classed into two categories: prezygotic and postzygotic barriers. Prezygotic barriers are physical isolation, behavioural isolation, temporal isolation, and mating barriers such as mechanical and gametic isolation. Postzygotic barriers are present after fertilisation and include reduced hybrid viability, reduced hybrid fertility and hybrid breakdown (Campbell & Reece, 2002). Generally hybrids are described as infertile, with the text book example being the mule which is a cross of a horse and a donkey where the two species have a chromosome number difference. This rule of infertile offspring between species as previously discussed does no hold true for all cases. Fitzpatrick & Shaffer (2007) compared the hybrid larvae in native California Tiger Salamanders (Ambystoma californiense) which are protected under the U.S. Endangered Species Act and in

Answer 2

In science you don't just read a paper looking for spelling and grammatical errors. The proof reader has to check and validate your references and be sure you used them properly. They also have to be somewhat familiar with the subject area.

I would suggest a student in your class or perhaps a teacher, other than the one that will be grading the paper. I would be careful asking here (Yahoo Answers) for this kind of help.