Top answers

Of what is the Central Nervous System comprised?

The brain and the spinal cord
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Answered by Paul W. • Biology tutor
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What is osmosis?

Osmosis is the diffusion of water from a dilute solution to a concentrated solution across a partially permeable membrane. Terms: Diffusion (the net movement of particles from a high to a low concentration.)...
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Answered by Charlotte L. • Biology tutor
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Megapode birds open and close the air vents of the nest at different times of the day. Suggest reasons why it is necessary to open and close the air vents.

There are a number of reasons why it is necessary to open and close the air vents. These include; allowing oxygen in, which is also necessary for respiration and allowing heat to escape. Closing the air vent...
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Answered by Davina R. • Biology tutor
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What is diffusion?

For the exams, the definition you will need to know is that "diffusion is the net movement of a substance from an area of high concentration to an area of low concentration, down a diffusion gradient&qu...
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Answered by Emily R. • Biology tutor
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Why do the muscles of the Iris contract and relax?

To alter the size of the pupil, so the correct intensity of light is allowed through. Enough light is let through to allow clear vision, but not so much light that the retina might become damaged.
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Answered by Calum M. • Biology tutor
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