In a typical marine food chain, which role do small, herbivorous fish occupy? decomposer primary producer primary consumer secondary consumer

How do living things obtain phosphorus

Knowing the importance of the essential elements, why would someone chose a diet that does not address all of them?

According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes