Begin by making a list of questions that will help you conduct research on the topic. To get you started, here are some questions that may lead you to a better understanding of the topic: How does artificial selection differ from natural selection? How did modern dogs evolve? Who are their ancestors? What is a dog breed? What is a pedigree? What methods are used to breed dogs? Are there any ethical issues with these methods? What are the benefits and consequences of dog breeding? What are bulldogs like? What traits does the English bulldog have? Are bulldogs more healthy or less healthy than other breeds? What is genetic diversity? What is the current genetic diversity of the English bulldog? How does the genetic diversity of the English bulldog relate to the breed’s future viability? Now write down four more questions about bulldogs that will help you strengthen your arguments in your research paper.

The answers to these questions are the following:

Artificial selection is different to natural selection because humans control this selection

Modern dogs evolve by artificial selection.

Their ancestors are the wolves.

Dog breed is the genetic cross between dogs.

Pedigree is a diagram that shows the family tree.  

Dogs are crossed depending on their physical and cognitive traits.

Dogs are crossed by artificial selection.

Ethical concerns: reduced genetic diversity may lead to health problems.

Benefits of dog breeding:  to obtain dogs with the desired traits

Bulldog is a dog race.

English bulldogs are dogs with a medium-size, they are strong and have a wrinkled face.

English bulldogs have health problems related to the reduction in genetic diversity.  

The reduction in genetic diversity of the English bulldog may lead to decrease the future viability of this race.  

Bulldogs have shown to have health issues related to the reduction in genetic diversity: short noses: difficulties to breath, folds in the skin: dermatitis, corneal ulcers and otitis externa.

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explanation:

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.