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Cell membranes serve as barriers and gatekeepers. ... Small polar molecules, such as water and ethanol, can also pass through membranes, but they do so more slowly. On the other hand, cell membranes restrict diffusion of highly charged molecules, such as ions, and large molecules, such as sugars and amino acids.
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Answer:
1.)Cathode rays are charged particles called corpuscles.
2) These corpuscles are the constituents of the atom.
3) They are the only constituents.
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The organ system that breaks down food is called the <u>digestive system</u>. It follows a process called <u>digestive track</u> which starts from the oesophagus and ends finally at the <u>rectum</u>.
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Consumptive rates are so high because water that is applied to a field is considered lost to the immediate water system. It either gets evaporated, used by the plants, or leaves the field as run-off. In addition, leaks or evaporation cause loss while water is being transported from the source to the field, often over great distances.
