Critical to the theory of evolution, Darwin needed to include an idea that was not generally accepted by scientists or society at that time. That idea was that

Which of the following groups is suspected of causing climate change?

In the context of natural selection, fitness refers to

Which of the following is a major drawback of dams?

The punctuated equilibrium model of evolution suggests that new species appear

The increased efficiency of fishing has led to

Environmental catastrophes are a requirement of natural selection.

Most dinosaurs became extinct at the end of which of the following periods of the Mesozoic?

The requirements of large amounts of fossil fuels and fertilizers in modern agriculture is one of the reasons that human society is unsustainable.

Which of the following types of compounds have been implicated in ozone depletion?