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What is Homeostasis and how does it work?

To understand homeostasis we first need to understand the meaning- the definition buzz phrase for this word is "the maintenance of a constant internal environment". Therefore it refers to the proce...
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Answered by Elspeth B. • Biology tutor
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Explain how the lungs are adapted for gaseous exchange.

The lungs are made up of tiny sacs called alveoli which presents a very large surface area for gaseous exchange. The lungs are well supplied with blood due to lots of capillaries covering the alveoli, consta...
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Answered by Jonathan T. • Biology tutor
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How do organisms obtain energy?

Organisms, such as humans, take in "substrates" such as glucose, in our food. During a process called respiration, we react these substrates with oxygen to give carbon dioxide and water; this takes...
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Answered by Alastair R. • Biology tutor
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Why food needs to be digested?

Food constitutes of a mix of nutrients, which cannot be used unchanged from the organism to cover its special needs. Digestive system is designed to convert complex molecules (like carbohydrates and proteins...
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Answered by IOANNA T. • Biology tutor
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Garlic contains a chemical called Allicin which has antimicrobial properties. Describe how this could have occurred through natural selection.

Allicin has antimicrobial properties and can therefore protect garlic from fungal and bacterial infections and is coded for in the DNA of the garlic by an allele. The presence could have been the result of w...
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Answered by Lorenzo C. • Biology tutor
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