Pretty sure the answer is oxygen, as it is produced in photosynthesis and consumed in respiration.
I believe the condition is infestation. Infestation is the state of being invaded or overrun by pests or parasites. It can also refer to the actual organisms living on or within a host. For example being invaded by ectoparasites such as lice, mites, or ticks. It may also refer to the presence of an unusually large number of insects or animals in a place, typically so as to cause damage or disease.
I can't help u bc I don't know this sorry
Abiotic:1.temperature 2.light 3.humid and rainfall4.salinity5.oxygen concentration 6.soil
biotic:1.consumer 2.decomposer
3.producers
