When we collected data on the opihi mollusks we had to measure the area. This is how we could know how many opihi were in the area per square meter. Our tape measures have feet and meters on them. The salt water makes them get sticky and sometimes they are hard to roll up. It is hard to know the exact area because the shore line is very rocky and jagged. We can't follow the shore exactly because of the waves too.
Image and writing by KCS Science Class
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