C
Explanation:
Molecule C would be least soluble in water because it is not a polar compound/molecule. It also lacks any unit that can combine with water to form a good hydrogen bond.
- The general rule of solubility is that like dissolves likes.
- Polar molecules will only dissolve in polar solvent.
- Water is a polar solvent with hydrogen bonds in them.
- Hydrocarbons typically have weak london dispersion forces between them and they are not polar.
- Other compounds have functional groups that can form hydrogen bond with water.
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Secretion helps in moistening the food, making it easier to swallow and preventing oral infections.
Fermentation is the process that releases energy without using oxygen . In cellular respiration, anaerobic fermentation contrasts with aerobic cell respiration. Both processes convert glucose from food into adenosine triphosphate for energy for cells.
This is called 'controlled' or 'prescribed' burning. Usually fires in the environment are regarded as undesirable and dangerous, but fires actually fulfil an important ecological role, and animals and plants had adapted to a certain frequency and intensity of fires. The seeds of some trees or grasses germinate after forest or grass fires, as the more open conditions after a fire allows the seedlings to compete and avoid being shaded and smothered by more established trees. Unfortunately, farming and forestry practices have in many cases resulted in a reduction of fires. A reduction in the frequency of fires also allows the build up of dead wood, and when a wild fire does occur, the amount of available fuel results in very hot, large and damaging fires. Therefore, management of forests and other environments such as prairies often use controlled burns to avoid the buildup of dead organic mass and to replicate the natural fire cycle.
