Which action is the best example of a direct observation?
identifying which bird was present by the tracks that it leaves in the sand at a beach
reading numbers on a heat sensor to conclude that there is a deer in the night woods
listening to a cricket chirp at night and counting the number of chirps per minute
determining the seal population of an island by counting seals in 10 square meters of the island

Question

Which action is the best example of a direct observation?
identifying which bird was present by the tracks that it leaves in the sand at a beach
reading numbers on a heat sensor to conclude that there is a deer in the night woods
listening to a cricket chirp at night and counting the number of chirps per minute
determining the seal population of an island by counting seals in 10 square meters of the island