Which of the following are true regarding geologic periods? i. periods are the longest intervals of geologic time. ii. a period may contain several epochs. iii. the quaternary period is the period of present-day earth. iv. the cambrian period is the last period of the mesozoic era.

For a to be healthy, it has to have lots of different kinds of plants and animals. all of the different types of plants and animals in an ecosystem. name four types of ecosystems from those listed in the video. b) c) d) most living things live here. all living things depend on how an ecosystem like a game of sticks? why should we build new buildings on existing land? name four extinct species from those listed in the video. b) c) d) the best way to wipe out a species is to the largest ecosystem in the world is this percent of the world is covered by water. how many of all species in the world live in the ocean? list five things you can do to increase biodiversity. b) c) d) e) how many species are we losing per hour?

Which would be the most useful source of evidence to support mcneill's contention?

How does science influence the decisions made about social, economic, and political issues?