He could ask questions related to the eating habits of these organisms, if they have nocturnal or daytime habits and if it is a predator and what are their predators.
Explanation:
In an ecosystem, a scientist is able to observe countless different organisms. These organisms can trigger a scientist's curiosity, causing him to pose some questions about the species he doesn't know.
In relation to animals, the scientist may ask:
Does this species have a nocturnal or diurnal habit?
Oxygen Oxygen is the final electron acceptor, no part of the process - from the Krebs Cycle through the electron transport chain- can happen without oxygen. Aerobic respiration is complete