What best describes what happens to energy and molecules in a stable ecosystem

Which statement best describes what happens to energy and

molecules in a stable ecosystem?

(1) Both energy and molecules are recycled in an ecosystem.

(2) Neither energy nor molecules are recycled in an ecosystem.

(3) Energy is recycled and molecules are continuously added

to the ecosystem.

(4) Energy is continuously added to the ecosystem and

molecules are recycled. Update: I kno what the answers is (4) but i dont get it

haah and this is a ap bio person talking

hey its hard when you go from difficult questions