Because there producers of most natural food
there are often at the bottom of food chains. Plants
this is because plants the only autotrophs on earth (meaning the only ones who can prepare there own food) prepare their food by a process called photosynthesis for which sunlight is an important component and as we know all living beings directly or indirect depend on plants for their food thus sun is very important for the food chain
Food chains are vital for life everywhere. Most food chains normally start with a green plant. However, the sun is the reason for the plants growing, but then I am moving on to photosynthisis
Food chains start with green plants because only green plants are able to convert the suns energy into sugars that all creatures including plant need to grow.
All animals are part of one or more food chains and the food chain starts with plants. Many of the very smallest animals eat plants, but most larger animals eat other animals. The bigger animals eat smaller ones. That is the chain. And that makes the smallest animals most important because they cause the chain to progress.
The food part i guess
food
it provides food and most important the oxygen
rice with wheat coming in second
Oxygen and food
Micro algae - the primary producer most of the time a producer like grass (since all plants are a producer)
The kind of organisms that are at the start of most food chains are producers. Producers make their own food and animals feed off of them.