After seeing these results, Ella wrote four questions in her lab notebook. Question 1: Why did the water level in the test tube go down?
Question 2: Is light needed to change the water level in the test tube?
Question 3: Did light cause the water level in the test tube to go down?
Question 4: Would a different type of plant change the water level in the test tube?
Ella set up an experiment to investigate one of her questions. She set up one test tube to look like
Figure 1. She set up another test tube similar to Figure 1 but without a lamp, and placed it in a
dark closet. A day later, Ella checked the water level in each test tube.

Explain why phospholipid molecules form a bilayer. (3 marks)

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.

What causes darkening of the skin as melanin production increases