Question

what are the features of planarians? warm blooded mammals, complex life cycle, hard protective coating parasitic, ribbon - like body, scolex with hook and suckers regenerative abilities, simple body plan, shaped like an arrow

Explanation:

• The first option is incorrect as planarians are not warm - blooded mammals, nor do they have a hard protective coating.
• The second option is incorrect because planarians are not parasitic (they are free - living) and do not have a scolex with hooks and suckers (that is a feature of tapeworms).
• The third option is correct. Planarians are known for their remarkable regenerative abilities, they have a simple body plan (they are flatworms with a relatively simple structure), and their body is shaped like an arrowhead (or arrow - like in a general sense).

Answer:

regenerative abilities, simple body plan, shaped like an arrow