Why are stone cells found in pears and not in berries?
a. stone cells are only found in fruits with peels and berries don't have peels
b. stone cells protect seeds and pears have more seeds than berries
c. stone cells are only found in fruit that grows on trees and most berries grow on bushes
d. stone cells make fruit firm and berries are softer than pears

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.

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

What would happen if the tubing with the yellow band was placed in a beaker of distilled water?