To provide a stable food supply, agriculture needs diverse crop varieties so that the failure of one or two crops is less likely to cause .

The tasmanian devil, a marsupial carnivore, is facing extinction due to devil facial tumor disease (dftd) which causes bulging cancerous lumps and lesions to erupt around the face and neck — often causing enough deformation to make seeing or eating difficult. dftd has evolved into a contagious cancer, a trait that is unique among cancers. devil mating behavior involves biting around the head and neck, allowing cells from one individual — especially cells from the crumbly dftd tumors — to be transferred to the wounds or face of a new individual. this marsupial was once found across australia, but sea levels rose, isolating the tasmanian population, while the australian population went extinct. what would be an outcome of genetic isolation that is likely to have impacted the spread of dftd? a) reduced territory puts diseased individuals in greater contact with non-diseased ones. b) inbreeding results in less variation in facial features so the cancer is generally fatal. c) genetic isolation has made it difficult for scientists to develop a vaccine against dftd. d) the lack of genetic variation in the immune system of tasmanian devils minimizes resistance to the disease.

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Unlike mendel's pea plants,humans can have a variety of heights,not just tall or short.what does this mean for human height? a.height is controlled by one gene b.height is controlled by more than one c.height is not genetic d.height is solely determined by whether or not you eat your vegetables