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Usin quadrats along a line is doing the same method before but...

1. Reliability - Quadrats are good tools for finding out if organisms are distributed but...

You can do this by taking a larger sample size, as bigger samples are...

Or use random samples, but note that this won't make the experiment...

2. Validity - To answer the original question, you need to...

You need to answer whether a difference in distribution is due to...

If you don't control all the variables, you won't know if...