1) After watching the video “How wolves change rivers”, in 2 - 4 sentences explain how human activity changed Yellowstone National Park. 2)examine the wolverines graphic at the very bottom of this document. Then in the space provided list specific changes to biodiversity in Yellowstone in the 1920’s and today

Yellowstone 1920's Yellowstone today

3)Describe how the elk population affects the size and growth of the trees during the data collection period shown in the graph

4) In 4 - 6 sentences explain the consequences of losses in biodiversity in an area.

Which of the following protists gets nutrients mainly by absorbing molecules from other organisms through their cell walls and cell membranes? a. amoebas b. water molds c. ciliates d. slime molds

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.

Penelope studies how the structure and function of the nervous system is related to behavior. she is a psychologist