9. which of the following lists has only biotic factors?\na. sunlight, temperature, conductivity, dissolved…

9. which of the following lists has only biotic factors?\na. sunlight, temperature, conductivity, dissolved oxygen\nb. sunlight, algae, ph, temperature\nc. algae, dissolved oxygen, nitrate concentration, ph\nd. algae, goldfish, moss, mushroom, crab

9. which of the following lists has only biotic factors?\na. sunlight, temperature, conductivity, dissolved oxygen\nb. sunlight, algae, ph, temperature\nc. algae, dissolved oxygen, nitrate concentration, ph\nd. algae, goldfish, moss, mushroom, crab

Answer

Brief Explanations:

Biotic factors are living or once-living organisms in an ecosystem. Option a has only abiotic (non-living) factors. Option b mixes abiotic (sunlight, pH, temperature) and biotic (algae) factors. Option c mixes biotic (algae) and abiotic factors. Option d lists only living organisms: algae, goldfish, moss, mushroom, crab, all of which are biotic factors.

Answer:

d. algae, goldfish, moss, mushroom, crab