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Biology
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Why is water being a solvent important?

dilute harmful substancestransport in bloodstream and plantsfor metabolic reactions to occurseparation of substancesabsorption of ions etc.

SA
2573 Views

What is the definition of a pathogen and give two examples. (3 marks)

An organism that can cause disease - e.g. virus, bacterium, fungus

TR
Answered by Thomas R. Biology tutor
3064 Views

Tobacco Mosaic Virus (TMV) causes plants to produce less chlorophyll leading to discolouration of the leaves. Explain why plants infected with TMV have stunted growth.

Less chlorophyll in the leaves means that less photosynthesis can occur. The process of photosynthesis produces glucose, so less photosynthesis will mean that there is less glucose produced. This leads to...

JW
Answered by Jared W. Biology tutor
4447 Views

Describe how an action potential is generated?

An action potential is an all or none response which has a threshold voltage which needs to be reached by the stimulus. A stimulus will call depolarisation of a nerve axon. This is caused on the entry of ...

SN
Answered by Susmita N. Biology tutor
3332 Views

The average lifespan of a human male can vary from 40 years to 85 years. The lifespan partly depends on the things available in the country where the man lives. Suggest three things that would increase the chance of a man having a longer lifespan.

The chances of a human male having a longer lifespan could be increased via a variety of factors and ways. Three examples of such ways are listed below.
The availability of clean, drinkable water for...

MV
Answered by Maria V. Biology tutor
2809 Views

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