What are marks left in rocks of once-living organisms called?

Ben should classify a mango tree as an autotroph because it makes its own food with photosynthesis. he should classify algae as a heterotroph because it relies on other living things to get food.

The  pelagic  region is divided into three zones. the top zone is the euphotic or sunlit zone. this is the ocean zone that sunlight penetrates. because this zone gets sunlight, photosynthesis can occur and plants can grow here.sub  zones. the oceanic zone is subdivided into the epipelagic,  mesopelagic, and bathypelagic zones. the epipelagic (euphotic) zone, also called the sunlit zone, receives enough sunlight to support photosynthesis.your question does not include multiple choice,but i can give you some info on what the 3 zones hope this : -)

While transcription can repeat and make multiple mrna copies of genes, and multiple ribosomes can translate the same mrna