What two features are first seen in the marine worms

What two features are first seen in the planarians? Planarians have bilateral symmetry, which is associated with the development of a head region, such as that seen in the flatworm. Another feature first seen in the flatworm is the possession of three cell layers: ectoderm, endoderm, and mesoderm (the middle layer).

Explanation:

the right answer is a. skin cells forming from sunlight.

the liver is an organ endowed with a fantastic ability to regenerate

. thus, if a hepatectomy (ablation) of 70% of the hepatic mass is performed in the rat, there is complete recovery in 7 to 10 days.

prokaryotes are beings that have existed since the existence of life on earth, and do not come from another realm.

ribosomes are organelles that exist naturally in eukaryotes, either in free form or attached to the endoplasmic reticulum.

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