Question

Two types of worms exist in London. One which comes out during the day and the other which come out at night. The day worms are eaten more often by the birds.

i) After a few years only night worms existed in the region. Why? (2)

ii) What kind of selection has taken place? (1)

Answer 1

i) Because the worms would have either learned to become night worms or all day worms would have been eaten faster than they could reproduce

ii) Natural selection. Humans had no interaction with which worms survived, so it's all natural.

I hope this helps! Good luck!