What on earth ? Making sense of a synoptic A-level Biology question #eduqas

Have a go at this one from an old Nuffield A-level Paper

The only prior  A-level knowledge you need to answer the question is that lactate is produced when ATP is made from anaerobic respiration.

All of the other knowledge is applying the principles of good experimental design and then reading the graphs to find evidence to support  a hypothesis.

Give it a go - just remember the question is not about spiders !