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How are the human lungs specialised for gas exchange?

Gas exchange is when oxygen is transferred from the air in the lungs to the blood and carbon dioxide is transferred from the blood to the air in the lungs. It occurs in the alveoli of the lungs.The lungs hav...
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Answered by Anna D. • Biology tutor
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When do I use the subjunctive tense?

It's better to think of the subjunctive as a mood rather than a tense. As a general rule, it is used to express a feeling of uncertainty in a sentence. Here are the main situations where the verb will need t...
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Answered by Jordan O. • Spanish tutor
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What is escape velocity?

This is the minimum initial velocity required to move from a point to infinity in a gravitational field. Infinity is defined to have a potential, V of zero; this is the point where the gravitational field ha...
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Answered by Ashkan P. • Physics tutor
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Outline the features of seismic waves.

Seismic waves are shock waves released by the rupture of rock duing an Earhquake. Seismic waves radiate from the focus of the earthquake and travel through rocks. Primary waves (P-waves) are compressional wa...
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Answered by Bethan D. • Geography tutor
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What is endosymbiosis and how does it relate to mitochondria?

Endosymbiosis is where two organisms live together, one inside the other: endo=in, sym=together and biosis=living. It is believed that mitochondria originated as eubacteria that were intracellular parasites ...
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Answered by Aidan H. • Biology tutor
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