I'm doing this exam too, I hate how they're both on the same day
I think for B2 the six markers could be:
*How does meiosis cause variation in the offspring of two parents?
*how is a new specie formed?
*Use of enzymes in industry, advantages and disadvantages
For B3 maybe:
*How does transpiration occur
*evaluating sports drinks claims
*How are biofuels produced?
*Advantages and disadvantages of battery farming
*
Howdoes the circulatory system move Oxygen around the body?*
Howdoes the kidney filter the blood?
*Ventilation- things like how does air move into the lungs, how does an ironlung work, how does a modern day ventilator work etc
Hope this helped and do you think this is right to say in an iron lung question:
"When air is pumped into the machine the vacuum is released and air is forced out of the lungs. This is a passive movement,"
I'm so nervous about these exams as in my mocks I've been getting low A's / high B's but I want a star