Dialysis tubing is a selectively permeable membrane that can be filled with a solution to simulate a cell-- assume only water can move in or out of the cell. A piece of dialysis tubing has been filled with a cloudy white solution of 5 percent egg protein dissolved in water to simulate a cell. This simulated cell is weighed and then placed in a beaker of water. After soaking in the water for one hour, the simulated cell is once again weighed. Where is the hypotonic solution? water beaker O simulated cell O neither, both environments are isotonic

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation:

c is the answer to this question. altitude affects the weather because air molecules evaporate.

the two answers are a, the population of birds with large beaks will increase on the island, and c, the trait for large beaks will be passed on to future generations through natural selection. the reason for that is because if the birds that have beaks developed for eating small seeds lose all of their food, they will go hungry and eventually starve because they physically cannot eat the large seeds, therefore making the population of large beaked birds higher. also, if the trait of large beaks are dominant on the island over small beaks, then over time the large beaked birds will reproduce more and more, while the smaller beaked birds will reproduce less and less because they can't survive with the food provided. that leads to the trait of small beaks disappearing and the trait of large beaks taking over the island.