I was recently completing a biology past paper the Scottish SQA 2017 Advanced Higher Biology Qualifications. The question is as follows:
To solve this, I did:
EPT Index = 100*(striped stonefly + net spinning caddisfly + flathead mayfly)/(total number of taxa) = 100*(6+6+3)/(44)=34.09%
So, I answered C, however, the answer is B. What mistake have I made?