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Biology
GCSE

How does evolution occur by natural selection?

Over time many theories have been put forward by the scientific community about how the process of evolution occurs. However the most commonly accepted theory amongst scientists is that evoluti...

Answered by Katy W. • Biology tutor
11855 Views

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...

Answered by Elspeth B. • Biology tutor
9779 Views

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; thi...

Answered by Alastair R. • Biology tutor
30151 Views

What is meant by diffusion?

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