Refer to the Graphs

question 194

Multiple Choice

Refer to the graphs. Based on the graphs, which conclusion can reasonably be drawn about future extinctions?

• A) Extinctions are a minor concern; only 1 percent of species have gone extinct, and more than half of all organisms are classified as of "least concern."
• B) Future extinctions are highly likely because 20 percent of assessed species are threatened-perhaps more, as data are deficient for another 20 percent.
• C) No conclusions can be made, because the graph only covers a small percentage of existing species and data are deficient for many.
• D) Only vertebrates are in danger of extinction; very few invertebrates or plants are threatened.
• E) Only amphibians have enough threatened species to warrant concern about future extinctions.

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Definitions:

Probability Calculus

A branch of mathematics that deals with calculating the likelihood of different possible outcomes.

Negation

The logical operation that takes a proposition to its opposite in truth value, from true to false and vice versa.

Event

An occurrence or happening, particularly one of significance, that can be distinctly identified in time and space.

Probability

The quantification of the chances that a specific event will take place.