) Suggest how the learners might obtain a more representative sample of pebbles if the investigation were to be repeated.
(2)​

Hello your question is open ended hence I will provide a more general answer

answer : Use of systematic sampling method

Explanation:

To obtain a representative sample of pebbles ( more representative sample ) Leaners should use Systematic sampling method . This is because systematic sampling covers the the entire population by obtaining samples from the population of pebbles at regular intervals hence it is a more comprehensive system of sampling when compared to Random and stratified sampling

answer; i believe the correct answer is (fluctuated);