The cell membrane controls the traffic of molecules into and out of the cell, prevents the entry of toxic material into the cell and permits selective uptake of nutrients. which property of the membrane can this be attributed to? a) carbohydrates present on the membrane
b) lipid bilayer of the membrane
c) membrane fluidity
d) semi-permeable nature of the membrane

What is the difference between a scientific hypotheses and a scientific theory?

Why are carbon dioxide concentrations expected to increase? a carbon dioxide concentrations are expected to increase, because fossil fuel burning is expected to increase b. carbon dioxide concentrations are expected to increase, because of an increase in agriculture. c.carbon dioxide concentrations are expected to increase, because more land will have to be cleared for increasing populations and agricultural use. d. all of the above select the best answer from the choices provided mark this and return save and exit next submit submit

Communication and transportation have improved as a result of scientific advancements. select the best answer from the choices provided of mark this and return save and exit next