AS Biology Edexcel IAL Unit 1 & 2 2015

Itts the opposite actually! In primary they are arranged in a parallel manner and in secondary they are arranged in a criss cross manner coz it gives more strength! I saw this in a mark scheme so i am pretty sure :3

How do you measure biodiversity?

Please don't discuss now many schools postpone the exams and some people have clashes so they do the exam later in the day so discuss in 2 hours

Posted from TSR Mobile

what did you guys get for the % answer?

and what did you guys write for the paper published to be declined by the scientific community?

350%

77.7%

what about that 2 mark question on why differentiated cells cant form stem cells?

this one was asking why it was difficult to turn specialised cells back into unspecialised stem cells right?

I said it's difficult because activated genes would have to be deactivated which doesn't happen naturally like the reverse process of specialisation does, so it requires other force to 'undifferentiate' the cell which can be expensive and time consuming as it's very difficult to reverse specialisation