Well, you could use a stopwatch to measure the times of each swimmer.
Political things might be testing nucular weapons and that causes a lot of damage. social might be riots and those are very destructive if they get out of hand
A pioneer species is the first species to enter an ecosystem or to go back to an ecosystem that has been destroyed. They begin the ecological formation which eventually leads to the ecosystem prospering with many different biotic and abiotic factors. Note that pioneer species can be plants or animals.
Answer: Elephants.
Explanation: The tusks of this organism fits the description of Elephants tusks.
