First, we have to know the definition of the following vocabulary terms:
Abiotic = non-living
Biotic = living
Then, it's just a matter of seeing which answer choice has both a living organism and a non-living part of the ecosystem.
Algae and sunlightAlgae is actually a living organism called a protist, which uses sunlight in a process called photosynthesis to create its own "energy" (just like plants).Sunlight is nonliving, but it is still an important part of the ecosystem especially for photosynthetic organisms like algae.