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Biology
All levels

Give 2 adaptions of the alveoli that maximise gas exchange

Curved surfaces, providing a large surface areaThin, providing a short diffusion distance

MH
Answered by Michael H. Biology tutor
2778 Views

Why would someone's hand jerk back when they touch something hot?

This phenomenon is called the 'jerk reflex' and is controlled by an electrical pathway along the nerves in your body. Once the hot object makes contact or comes close to the skin receptors will pick up th...

KC
Answered by Kayden C. Biology tutor
7264 Views

How can donepezil improve communication between nerve cells?

Donepezil is an inhibitor of the enzyme acetylcholinesterase.
Acetylcholine is a neurotransmitter that diffuses across synapses, b...

SW
Answered by Sarah W. Biology tutor
5845 Views

Nitrates and phosphates from fertiliser applied to crops may enter ponds and lakes. Explain how nitrate may cause the death of fish in fresh water.

Plants need three main nutrients to grow, which can be helpfully abbreviated as NPK: that's nitrates, phosphates and potassium. Many gardeners and farmers will apply these fertilisers to crops in order to...

IC
Answered by Imogen C. Biology tutor
7230 Views

Explain how a mutation in DNA could cause a non functioning enzyme to be formed

A mutation could change the order of DNA bases which would alter the type of amino acid produced from a DNA triplet. Therefore, the enzyme, which is a pr...

HW
Answered by Hannah W. Biology tutor
8342 Views

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