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Sexual production ensures that genetic mutations take place among the animals and human beings. This mutations occurs in various stages like in meiosis this provides a site for the combinations. Sexual reproduction ensures that the best traits are passed hence the advantage is that favourable combinations are got and the unfavourable traits are wiped out. Therefore, the masses with favourable traits will survive in the environment and exploit them fully produce a lot of off springs than those with unfavourable combinations of genes.
This is the study of different body structures of different species to know how they are adapted to different tasks and to understand the adapted changes that have occurred through the life dating from their ancestry to date. In Darwin’s study he tries to explain that different body study structures that one species can look the same have risen to perform different functions. For example birds and insects have wings but they use them differently. The birds use them to fly and to cool their bodies and insects only use them to fly. Some birds have wings but can’t fly for example the ostrich thus the homologous structures are different but have risen to perform similar functions.

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