Question

which is abiotic?
tree sap
insect
sunlight
tree stump

Explanation:

Abiotic factors are non - living components of an ecosystem. Tree sap is a part of a living tree (biotic). An insect is a living organism (biotic). A tree stump was once part of a living tree (biotic). Sunlight is a non - living factor that affects the ecosystem.

Answer:

sunlight