8. Gamekeepers who hunted birds for leisure in the 1800s wanted a dog that didn't actually

exist, so they mated a mastiff and a bulldog to get the qualities that they wanted. Mastiffs were

big and strong. They were also good companions, but they lacked speed and aggression. The

bulldog however was aggressive and fast, but lacked in strength. Through mating, they

eventually produced a bullmastiff, which was large, quick, strong and aggressive.

This technique is known as

Selective breeding by controlled mating

Explanation:

This technique is used by scientists, breeders, and more. In order to study and breed selected types of animals/plants to get and bring out the ideal traits they're looking for as your statement said.

false because ozone (o3) depletion does not cause global warming, but both of these environmental problems have a common cause: human activities that release pollutants into the atmosphere altering it.

global warming is caused primarily by putting too much carbon dioxide into the atmosphere when coal, oil, and natural gas are burned to generate electricity or to run our cars.

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