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Biology
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How do fish carry out gas exchange efficiently?

Fish use specialised surfaces called gills to carry out gas exchange.

Gills are highly folded, giving them a large surface area and maximising the efficiency of gas exchange.  The gill fi...

SB
Answered by Shoam B. • Biology tutor
124015 Views

How does speciation occur?

Reproductive separation occurs, this could be through geographical separation. (1)

Therefore no interbreeding in the population. (2)

SB
Answered by Shoam B. • Biology tutor
6058 Views

How does a neuron maintain its resting potential and why is it important?

The membrane of an axon contains a large number of protein channels along its length, which all fall under three categories: the sodium/potassium pumps, the voltage-gated sodium channels & the volt...

FB
Answered by Ferdinand B. • Biology tutor
26159 Views

What is Evolution?

The Theory of Evolution states that organisms change (evolve) over a long time (from simple life forms) due to natural selection.

Natural Selecti...

DY
Answered by Dominic Y. • Biology tutor
3874 Views

What is the structure of DNA?

DNA is a double helix. Consisting of two strands, which are made up of bases A T C and G

Complementary base pairing occ...

TD
Answered by Thomas D. • Biology tutor
3424 Views

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