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What are the different ways in which substances can move across cell membranes?

Passive transport Diffusion = occurs in gases or aqueous solutions whereby particles are free to move and spread from a higher concentration to a lower concentration. An example is air freshener being spr...

AR
Answered by Alisha R. Biology tutor
6839 Views

How can I revise for the A Level Spanish oral exam?

Make lists of useful vocabulary for the main topics covered throughout the course, as these will come in handy during the exam. Try and go over these and test yourself in the days before the exam. A pract...

GH
Answered by Georgina H. Spanish tutor
10194 Views

How should I approach the unseen commentary (IB English Paper 1)?

Paper 1 consists of a prose and a poem. Take a moment at the start of the exam to skim through both and choose a passage for analysis.

Next, dedicate a quarter of your time to reading, highlighting...

MN
11647 Views

What is palaeomagnetism?

Palaeomagnetism is a record of the Earth’s past magnetic field. When lava is erupted at the surface, magnetic minerals, such as iron, in the lava align parallel with the Earth’s magnetic field. The magnet...

LA
Answered by Lucy A. Geology tutor
17700 Views

How does energy move through a food chain?

In most food chains, all of the energy which is used originally comes from the sun. Plants are "photoautotrophs", which means that they can use light energy from the sun to fuel their life proce...

DM
Answered by Daniel M. Biology tutor
30071 Views

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