Answer:
A countercurrent system a more efficient system for gas exchange. Because water is viscous, this would require a lot of energy, so the counter-current system is a more efficient way of increasing the amount of oxygen diffusing into the blood. The unidirectional flow of water is another advantage.
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Answer:
Explanation:
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Answer:
Fertilization in plants: Fertilization is a process in which male gametes fuses with female gametes forming fertile zygote. The first step of fertilization is pollination in which pollens fall from the anther on the stigma of carpel. From stigma, the pollen grains goes to the ovary and fuses with ovule and fertilization occurs. During this fusion, seed is formed.
Explanation:
Volatile substances evaporate or sublimates at room temperature or below. Volatile substances have higher vapor pressures <em>versus</em> non-volatile substances at the same temperature.
Examples of volatile substances include: alcohol, mercury, and gasoline.
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