40 points the figure shows a classic experiment that demonstrates the principle of osmosis. the left side of the u-tube is filled half-way with 10% red sugar water. into the tube on the right, distilled water is poured until it is even with the red sugar water. a semi-permeable membrane is placed in the brown area. predict what will happen in the u-tube after several hours. a) the membrane in the middle will melt away and both sides will mix. b) both sides will become 5% red sugar water, and will be at equal marks on the u-tube given enough time. c) the left side of the tube will remain red, but rise in volume, as the right side of the tube falls in volume. the distilled water will dilute the sugar water. d) the left side will remain red, but it will fall. the right side will remain clear, but it will rise, as water moves from the 10% sugar water to the distilled water.

You decide that the introduction should also discuss the extremophiles that are referred to as the archaea. these single-cell organisms are considered "extremophiles" due to their ability to survive and reproduce in environmental conditions that would be hostile for most living organisms. archaea species have been isolated from highly acidic sulfur springs, ocean floor thermal vents with temperatures that exceed boiling, and subarctic ice well below freezing. while still considered to be prokaryotic, the archaea have numerous differences that place them apart from the bacteria. choose the characteristics that separate the archaea from other prokaryotic cells. select all that apply. view available hint(s) select all that apply. archaea lack true peptidoglycan in their cell walls. the morphology of the cell is rigid and is geometric in shape, similar to a sphere or cylinder. the cytoplasmic membrane lipids of archaea have branched or ringform hydrocarbon chains. all currently identified and characterized archaea have been linked as the causative agent to an animal or human disease.

1. variations in a population of moths allow for some of its members to be able to adapt to environmental changes. the better adapted of the moths will be able to survive the change and thus prevail as the “fittest” of the species. (a) describe three mechanisms in which variation can occur within a species population. (b) explain which mechanism or mechanisms would be responsible for the survival of a population of peppered moths better than white moths in an environment affected by industrial soot. justify your answer.

An uncomfortable feeling in the ears when descending in an airplane is caused by changes in air pressure on the: a. inner ear b. middle ear c. eardrum d. hammer/anvil