Which of the following scenarios is the best example of evolution? a a particular species of flowers in a meadow were pollinated by bees for several hundred years. over time, fewer and fewer bees can be found in the meadow. some hummingbirds are attracted to a few of the plant species with brightly colored flowers. over time, more of the plant varieties now have brightly colored flowers. b. a mouse is nearly caught in a mouse trap. the mouse learns through that experience to stay away from mouse traps and teaches her offspring to avoid mousetraps. mice are no longer caught in mousetraps. c. a tidal wave removes all of the grass on an island. d. a population of mice lives in a forest. a species of tree is introduced which reduces the amounts of nuts available for the mice. there does not appear to be a change in the mice over time.

According to the diagram, what sources contribute to the phosphorus found in soil? according to the diagram, phosphorus found in soil contributes phosphorus to what other sources? (site 1)

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 which situations is the principle of cross-cutting relationship useful in determining relative age?