Atomic number The atomic number of each element is different than other Elements.
Isn't it a because in b at the start of the equation the E in Fe just disappeared
Assuming that the nests are bird's nests and the data is a data gathered by the biologists about those nests.
A hurricane would cause some damage to the nests that is existent and cause a remarkably low count even during breeding season. It would also influence later birds because of population weakening due to the hurricane.
You should always do A. form a hypothesis before performing an experiment also the other options cannot happen until after an experiment.