The structure of the cell membrane was discovered in 1895 by . Finding a similarity to Olive Oil, he discovers membranes are made of . A. Charles Overton, amino acids
B. Irving Langmuir, lipids
C. Gorter and Grendel, amino acids
D. Charles Overton, lipids

Someone me with this: a mineral' is determined by its actomic structure.

African penguins, which inhabit the coasts of southern africa, were classified as an endangered species in 2010. two significant threats to their survival are ecosystem damage from oil spills and overfishing by humans. overfishing depletes the food supply of african penguins. the best method to reduce the threat of overfishing would be to . the risk of oil spills could be reduced by increasing the use of , which should oil consumption. if an oil spill does occur, could be used to remove the oil so the ecosystem may more quickly recover.

This is an active transport mechanism by which cells pump sodium and potassium ions against the concentration gradient