Estimates of Current Rates of Extinction

question 64

Multiple Choice

Estimates of current rates of extinction

• A) indicate that we have reached a state of stable equilibrium in which speciation rates equal extinction rates.
• B) suggest that one-half of all animal and plant species may be gone by the year 2100.
• C) indicate that rates may be greater than the mass extinctions at the close of the Cretaceous period.
• D) indicate that only 1% of all of the species that have ever lived on Earth are still alive.
• E) suggest that rates of extinction have decreased globally.

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Definitions:

Hallmarks

Distinctive features or characteristics that are typical of a particular condition, process, or product.

Addiction Patterns

Recurrent behaviors or habits that are characterized by compulsive engagement in rewarding stimuli, despite adverse consequences.

Cultural Practices

The shared activities, rituals, and traditions of a group of people that are passed down through generations.

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The immediate physical and social setting in which people live or in which something happens or develops, including the culture that the individual was educated or lives in.