GCSE Biology Revision "Correlating Risk Factors"

[@anonymousyouth7479]

Sir, my exams are very very soon, & I have watched your videos from the very beginning. I want to thank you for making these videos because I don't think I would've been the slightest bit confident about my science exams as I'm taking triple. I am going through your videos with my flashcards and completing exam questions after every topic. I hope this is ok enough for me as I feel like I'm not doing enough... thank you once again though.

[@Freesciencelessons]

Thanks for the comment. I'm glad that you're finding the videos helpful. Can I check that you made your own flashcards? The ones that were on my website are for the old spec and should not be used.

[@anonymousyouth7479]

Yes, I have made my own flashcards, I thought so that those flashcards were for the old spec so didn't bother using them.

[@eruptor2222]

Triple here too, first exam in terms of science on Tuesday, should be the same for you I’d imagine. Literally binge watching these videos.

[@anonymousyouth7479]

Yes, first exam is tuesday for me.. good luck to you, I hope we get the grades we want & it's all paid off.

[@jackgodwin8693]

anonymousyouth he is carrying me to my science gcse, as very helpful for triple science

[@shakibam8356]

Thank you soooooo very much. I have been binge watching your videos all over again and taking notes... my wrist is almost snapping off! Fist bio test on the 15th. Thank you for guiding me through my GCSE's.

[@mahn08r]

what did you get

[@husaindholfar3785]

I love how timeless this channel I bet my children will be watching free science lessons in 20 years

[@herrforehead]

I was so excited to get this video that my teacher attached to the homework because my other teacher showed some of your videos in a physics lesson :D

[@curtispaleontology]

I have my Biology paper 1 exam tomorrow, thanks for the help Shaun, currently at a Grade 6 thanks to your help

[@thisperson6708]

Ha! For a year I’ve been calling it a “casual mechanism” instead of a “causal mechanism” because my teacher only ever called it casual.

[@Batman-ro9mj]

Me too 😂

[@bertiemassey522]

@@Batman-ro9mj same

[@mgco-3]

biology paper 1 tomorrow😭😭

[@studyaccount7677]

sir, is it possible for you to reference which part of the specification this video and other videos are about (for example it could be 4.2.2.6)

[@punasheh5460]

1.5 playback speed 👌

[@Tfx-ik2go]

0.25 playback speed 👌

[@Shadowgamer-wn7jp]

Hi sir do you know any website where I can revise the practical keywords ( such as "Control variable" ecc )? Thank you very much!

[@Freesciencelessons]

I'm afraid that I don't but they will be covered in my revision workbook which I'm releasing in September.

[@kokotaylor4827]

do we need to know the history of lung cancer or is it just an example?

[@TheRealIsmail]

no

[@kasimmahmood-r4407]

+Freesciencelessons I have been watching your videos for a long time for GCSE and was wondering if your are going to be doing A-Level Biology(maybe Edexcel SNAB). Thanks.

[@BRFCMontages]

He is in late 2019!

[@moa9658]

K where did he say that?

[@EvangelineBell]

why for sampling is there a picture of sausages?

[@kindofcomplex9304]

Diet

[@chrisch-qb1kl]

What is the definition of a causal mechanism? I’m a bit confused on the difference between a correlation and causal mechanism 💔

[@Freesciencelessons]

A causal mechanism is a scientific explanation for something. We can scientifically explain the link between cigarette smoking and cancer in terms of increased mutations. A correlation simply states that two things appear to show a link (eg cigarette smokers have a higher incidence of lung cancer than non-smokers). A correlation does not explain what causes the link. And in fact, just because two things show a correlation does not show that one causes the other (that's why you also need a causal mechanism).

[@jwilkins5136]

That last image is not even funny, so hungry now.

[@jwilkins5136]

Great videos though. Are all the paper 1 content for each subject finished?

[@eddek844]

bro?

[@Hammad-dk1qu]

1.5 speed for cramming 🥴

[@bex5749]

ive gone with 1.75

[@stegosaurus8348]

2x

[@mikagalvz3702]

Soo, how do you know wheter a risk factor is linked to a non-communicable disease? Is it to study the patterns of the disease to know the risk factors of the certain disease and see if there is a correlation or link? Thank you x

[@Freesciencelessons]

Yes for non-communicable diseases, you need to study the patterns of disease. This is called epidemiology.

[@mikagalvz3702]

Thank you so much!

[@TamilEelam1]

@@Freesciencelessons Hi sir. Do we need to know what epidemiology is as I couldn't find it in my revision guide? Thanks!

[@PT-jt9xv]

why does my revision guide not have this ??

[@Freesciencelessons]

I'm using this example to illustrate the idea of using statistics to identify causes of disease.

[@casinovathedon8924]

@@Freesciencelessons Sir whats the difference between correlation adn a causal mechanism

[@Freesciencelessons]

A correlation is when two factors appear to increase or decrease together (or one could increase and the other decrease). This does not mean that one factor is CAUSING the increase or decrease of the other factor. They could be completely unlinked. A causal mechanism is a possible scientific explanation for HOW one factor could cause another factor to increase or decrease. However, a causal mechanism does not PROVE a link, it just explains how there could be a link.

[@casinovathedon8924]

@@Freesciencelessons thanks so much sir so does that mean smoking is a causal mechanism for lung cancer

[@casinovathedon8924]

@@Freesciencelessons and excercise is a causal mechanism for decrease of obesity?

[@xtinkt]

Anyone else revising an hour before the exam

[@shahzainnooruddin8375]

what exam board is this for as it isnt in the aqa spec

[@Freesciencelessons]

It's AQA. It is in the spec but not explicitly stated as such.

[@wiktorlis6380]

What is the definition of a causal mechanism?

[@sarah5138]

do we need to know about the history?

[@Writergal1]

I don't think it's a main thing you need to know

[@oseilamar8166]

Do we really have to know this?

[@phoenixisalive3755]

pov ur biology gcse is tmrrw😜😜

[@TheCaptainH]

I just wanted to find out what exam board you are teaching, as I do Edexcel Triple, carcinogens is not stated in our specification, so therefore I am not really sure if this would benefit me, unless it does come up at least I will have the knowledge.

[@manav2882]

Hannan Jawad aqa

[@kesleybawden.2824]

LIFE SAVERRR

[@tanmeetsachdeva4359]

Bio mock today

[@mogzack]

Well…these cancelled GCSE’s are a bit shite

[@mycockisincrediblysmallbut6140]

1:11 that looks like a juicy steak

[@sana-cs7qx]

Guysss 24 gang

[@holycomputer6294]

im failing

[@jaydubelyew6811]

Chad