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contestada

Please help. I'll mark brainliest if you get it correct.
1. Is this a simple sentence?

The baby bird opened its mouth to be fed.

2. Is this a compound sentence?

The hamster is hanging from the rope.

3. Is this a complex sentence?

The dog is jumping on the trampoline.

4. Is this a compound-complex sentence?

Although the computer is not real, the cat seems very focused on his "work."