2 A student investigated the diffusion of substances through Visking tubing, an artificial membrane which has some of the properties of cell membranes. The student made a bag of Visking tubing as
shown in the image. The student added some iodine solution to the water in the test-tube. After 30
minutes at room temperature, the contents of the Visking bag were stained blue-black, but the
water outside remained a yellow colour.

Describe two recent or ongoing space missions.

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.

Name the tissue that in translocation