What is The defination of food chain?

Answer 1

*Food chains and food webs and/or food networks describe the feeding relationships between species in a biotic community. In other words, they show the transfer of material and energy from one species to another within an ecosystem.

As usually diagrammed, an organism is connected to another organism for which it is a source of food energy and material by an arrow representing the direction of biomass transfer. Organisms are grouped into trophic levels—from the Greek word for nourishment, trophikos—based on how many links they are removed from the primary producers. Primary producers, or autotrophs, are species capable of producing complex organic substances (essentially "food") from an energy source and inorganic materials. These organisms are typically photosynthetic plants, bacteria or algae, but in rare cases, like those organisms forming the base of deep-sea vent food webs, can be chemotrophic. All organisms that eat the autotrophs are called heterotrophs. They get their energy by eating the producers.

**A food chain is an idea developed by a scientist named Charles Elton in 1927. He described the way plants get energy from sunlight, plant-eating animals get their energy from eating plants, and meat-eating animals get their energy from eating other animals. The idea of a "chain" means that all these animals are linked together, so anything that affects one "link" in the chain affects everything in the chain. The first link in the chain, the plant, is called the producer, while all the links above it are called consumers.

Answer 2

Who eats whom. Humans are at the top of our food chain, because we eat all the other plants and animals that we farm and raise. At the bottom of food chains are fish that eat other organisms. Eventually, things eat bacteria and algae. Every Thanksgiving, we give thanks for all that we have at the top of our food chain.

Answer 3

Fly eaten by spider.
Spider eaten by frog.
Frog eaten by fish.
Fish eaten by bear.
Bear eaten by human.

It is following the who eats what all the way through to the top of the food chain.