Supposed :)
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I believe this an example of complex sentence structure.
My reasoning is that most of these sentences are in fact compound complex sentences-
Compound-complex sentences contain two independent clauses and at least one dependent clause.
An example of a complex sentence is this: “I burned dinner but not the cake.”
I think i may have had the same text and my answer was snake... hope this helps have a nice day
Answer:
Garbage is a problem because it kills fish in lakes and pounds and causes pollution
Explanation: