Planarian, any of a group of widely distributed, mostly free-living flatworms of the class Turbellaria (phylum Platyhelminthes). Planaria is the name of one genus, but the name planarian is used to designate any member of the family Planariidae and related families. Most planarians occur in fresh water and are sometimes seen in large masses; some species are marine, others are terrestrial. Some species are

Explanation:

some species are marine, others are terrestrial. Some species are parasitic; i.e., they obtain nourishment from the body of another living animal.

poison levels are being represented and it show how much poison the producer has and how much the consumer has   and damage the organisms in it, particularly in the predators at the end of the chain. this is because accumulating compounds cannot be excreted.

answer: 21

step-by-step explanation:

divide 630 by 30. 30 goes into 630 21 times