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

wheres the answers ?

transformative rocks are the stones that emerge from the transformation of existing rock composes in a procedure called changeability, implies changing of structures. transformative rocks are shaped from alternate shakes that are changing a result of warmth or weight connected. one of this model is the earth developments that making rocks profoundly cover or crushed which will make the stones warmed and put under awesome weight. they are not softening but rather the minerals they are containing are changed synthetically that will shape transformative rocks. now and again different rocks are shaped when the others are near some liquid magma and getting warmed.

what are the awnser choices? i mean, without choices, it is an incompleat

for a different answer set the answer would be because the oxygen in the water had depleted (apex)