What plants or animals are the primary producers in this food chain?

In many ecosystems, the bottom of the food chain consists of photosynthetic organisms (plants and/or phytoplankton), which are called primary producers. The organisms that consume the primary producers are herbivores: the primary consumers. Secondary consumers are usually carnivores that eat the primary consumers.

on island x the species needed to adapt because they were being subject to predators which didn't inhabit island y.  

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explanation: