Extinctions have occurred often throughout the Earth's history. Which statement best explains why this is the case? a. The Earth could no longer support so many creatures.
b. A dominant species will take control and eliminate the other local organisms.
c. Events might occur that change the Earth enough to cause extinction.
d. The climate will spontaneously change.

Which part of a mountain receives the majority of moisture due to the rain shadow effect? a. the leeward side b. the windward side c. the bottom of the mountain d. all parts of the mountain receive equal amounts of moisture.

Some gamma ray bursts are hypothesized to come from mergers of neutron stars or black holes. if this hypothesis is correct, what else should we in principle be able to detect from such mergers? a. gravitiational waves b. x-ray bursts c. significant disruption of gas thousands of light-years away in the surrounding galaxy d. an "afterglow" of bright visible light, lasting for weeks

¿qué parte de la patagonia está en peligro de exinción por su sobrepesca?