Photographs and simple text examine the harmful effects of animals and insects that are introduced to new habitats, discussing how they get there and ways to control invasive species, and describing examples from history.
Examines the impact of an invasive plant species on an environment, discussing how new plants get introduced into foreign habitats, and describing examples from history.
Explains what fossils are, describes the two main kinds of fossils and how they form, and discusses how fossils are discovered and what they reveal about the history of life on Earth.