What characteristics do all producer in common

they give the nutrients to the primary consumers.

Explanation:

producers are like-plants that are consumed by deer/bunnies etc. All those nutrients will decrease at the upper levels at the food chain so they have to have enough nutrients to keep the animals alive and healthy. When the lion eats the deer ( it was an example) some of the nutrients and minerals that the deer ate from the plant will be consumed by the lion while its being eaten.

Hope this helps:)