The Salivary Glands, Pancreas, liver and gall bladder are considered to be accessory glands of the digestive system, since they are not really part of the digestive tract, but they play a role in digestive activities, that is why they are considered to be accessory glands. Their digestive activities may include providing energy and nutrients for the body.
Translocation theories refer to the process that explain water transportation in plants. We found three great theories: capillarity, root pressure and cohesion. Capillarity refers to the property that displays water when encounterd with small tubes, water "sticks and climbs" through the tube. The smaller the diameter the greater the climbing. Root pressure, refers to the effect salts and minerals absorbed in root, along water, exert in the content previously absorbed. That is, the "new generation of nutrients" pushes upward nutrients previously absorbed. Finally, cohesion theory is similar to capillarity. It refers to the property water molecules have to keep in close contact, due to their hydrogen bonds. Water forms a continuum through the plant. Water is losed through evapotranspiration in the leaves, so as water is losed, water from the stem starts to move. In that way water keeps the "continuum" and fills the gap that evaporated water left.
Most food chains are limited to three or five trophic levels because the energy available is only enough for those number of trophic levels: there is insufficient energy to go round more trophic level. At each trophic level, a large quantity of energy is used to maintain organisms at that level, because of this, organisms at one trophic level, pass less energy to the ones at the next trophic level. <span />
A characteristic of carbon is that it is highly reactive and can form unstable bonds with any available atom.
They are able to travel in a vacuum at the same speed.
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