Hey, so I'll copy the markscheme and try to give you a break down of what I think it means (I remember doing this in a mock class test, it screwed my head right over, teacher didn't like it either)
1. Fewer larger animals/more smaller animals where more
people/more disturbance; I would have said, more people so there is more disturbance, so plants cannot grow to there tallest/biggest because the soil etc disturbed.
2. 0.09 linked to 34.6/appropriate link between row 4 and
row 1;:
I think this means, low biomass, low abundance of animals as more humans about scaring off the animals so they feed less
3. Larger animals affected by human activity;
animals scared off?
4. Smaller animals are young animals;
Smaller animals, small biomass, younger, not grown up yet (wouldn't have got this one)
5. Fewer species of seaweed (with disturbance);
Only the well adapted survive, competition etc etc, decrease in diversity, decrease in food
6. (So) fewer niches /habitats (for large animals)
Tie in with point 5
Definitely the hardest HSW question I've seen, those ratios grrr