Top answers

What is active transport?

The movement of molecules from an area of high concentration to low concentration across a membrane using energy.
JW
Answered by Jessica W. • Biology tutor
3755 Views

What is meant by 'metabolic rate'?

Metabolic rate is the speed at which chemical reactions take place in our bodies
GH
Answered by Georgina H. • Biology tutor
7070 Views

What are the best strategies/ ways of helping me revise?

- Running through past exam papers - Reading, memorising, and re-writing - Taking regular breaks
GH
Answered by Georgina H. • Biology tutor
4176 Views

Explain how smoking can increase blood pressure?

There are two main reasons that smoking can increase blood pressure: Cigarette smoke contains nicotine which, once inhaled, can enter the bloodstream and cause the release of adrenaline which increases the h...
OH
Answered by Oliver H. • Biology tutor
8260 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 Selection: this is based on 3 key points. 1: that there is a lot of d...
DY
Answered by Dominic Y. • Biology tutor
4804 Views