Question

Which statement accurately describes the status of global biodiversity and extinctions today?

a. Over the last 300 years, the rate of species extinction has remained constant.
b. Prominent biologists have concluded that human impacts are causing a sixth mass extinction.
c. Humans are contributing to the planet's first mass extinction.
d. Nearly 75% of existing bird, mammal, and amphibian species are now threatened with extinction

Answer 1

Biologists have concluded that human impacts are causing a sixth mass extinction, with the current rate of species extinction being 500-1000 times higher than the background rate.

Step-by-step explanation:

Biologists have concluded that human impacts are causing a sixth mass extinction, making option b. the most accurate statement about the status of global biodiversity and extinctions today.

Scientists estimate that the current rate of species extinction is 500-1000 times higher than the background rate of extinction. This rapid decline in biodiversity is primarily due to human activities such as habitat destruction, introduction of exotic species, and overexploitation of resources.

While option c. is partially correct in stating that humans are contributing to the planet's first mass extinction, it is important to note that previous mass extinctions were caused by natural events, while the current extinction crisis is solely due to human actions.