A Level Biology Revision "Gas Exchange in Mammals" 

hello sir i am currently about to do my gcse but i wanted to comment on this video so there is more chance of you seeing it. i cannot explain how much your videos have helped me, you are the main source of my science revision. i think i speak on behalf of most students in the uk when i say thank you.

Sir I have only one request Sir please make video on use of colorimeter for enzyme catalysed reaction with worked examples A level Biology Please sir ❤️

I will be using this next year, thank you

Greetings Shaun, I am now 19 but you helped me a lot during 2019 GCSE finals, so thank you a lot mate, you get virtual tea from me, enjoy your tea the next time you have it mate.

I bought the science chemistry combined science revision. It has helped me so much! thank you!

thank you for another banger video, mr freesciencelessons!!

literally saving my life

can you make merch I will buy

Thank you, I’ve got a test on this !

Hi! I love your videos sir and, considering exams are so close, had an impromptu request for a video. A lot of GCSE science past papers have questions based around practicals but they are more like 'how could you improve this practical' or like 'why may this not be accurate/ representative' type of questions where we must suggest things like 'take more repeats, larger sample, means, values in between, equipment is wrongly used or better could be used'. There are so many types of these questions and so many potential answers yet I am so confused on how to answer them in a systematic and sometimes use the wrong answer for a question (take more repeats when the question is meant to be asking about the equipment/ finding it hard to find the mistake itself) so could you please do a video on how to answer those types of questions, depending on the style of question and whether it is an investigation into a group of smokers for example or whether its a photosynthesis practical? These are just examples. I know it is a lot to ask for but I feel those types of questions based around application of practical techniques are both easy marks yet difficult at the same time and can make a huge difference to one's overall score. I, and many others, will surely appreciate it. Thanks!

Very useful thanks :)

Do you think the grade boundaries will be lower this year even if the country does well in exams?

Why is the cie board not included 😢

👍

Nice

nice

Sir, I had a really important question. Do your gcse videos help in igcse 9-1 in the same way?

Any a level students here ??

i watched this thinking that this was GCSE level, this isnt GCSE level.