A food chain always starts with a producer. A producer is an organism that makes its own food. Most food chains start with a green plant, because plants make their own food by photosynthesis.

All organisms in an ecosystem depend on each other. Food chains show the flow of energy from one organism to another. Food chains show the feeding relationships between organisms. Food webs show ...

Microplastics begin to travel up the food chain when predators consume prey ... a comprehensive threat to the health and ...