YES. All planktons are microscopic. Plankton refers to microscopic sea organisms. We also have;
Phytoplankton which are microscopic plants
Zooplankton which are microscopic animals.
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Mixtures. Hope this helps you!
Answer: 1 million
Toxins will be accumulated in the higher level pyramid, this phenomenon is called biomagnification. The rate of biomagnification from water to producer approximately 1000 times, while the rate for every level above producer around 10 times. Assuming the bird is a tertiary consumer, the rate would be 1000* 10^3= 10^6= 1 million times