The correct answers are under predation and under rainfall. The reason for migration can be rainfall, because some herbivores follow the rain to new sources of water and grass. Also, predators migrate because they follow some animal migrants that are used for food, so predation is one of the reasons that lead to migration.
The answer in the space provided is anaerobic respiration.
It is because this allows of having to utilize other substance than oxygen such
as nitrate or sulfate to be their electron acceptors in which is for organisms
that undergoes respiration.
The major differences are that fats are solid at room temperature while oils are liquid, and that oils are usually of plant origin while fats are of animal origin.
Hemoglobin carry oxygen from lungs along with blood and it to various tissue for their metabolism ...then after it receive metabolic waste I.e. CO2 gas from it to lungs
