B. The fertilizers used by farmers contaminate the river.
We only know about extinct groups like dinosaurs, ammonites and trilobites through fossils. Some animals and plant are only known to us as fossils. By studying the fossil record we can tell how long life has existed on Earth, and how different plants and animals are related to each other.
What happened in South Africa is that the regime fell under the international pressure (the correct answer is b). Some example of this international pressure were trade sanctions, prohibition for the officials to enter other countries and the lack of permission to fly over the airspace of other countries.
the answer is C because its near water
