Most species facing extinction today are threatened because of: A. living in biodiversity hotspots. B. changing climate. C. the recent impact of a large comet. D. large quantities of dust in the atmosphere. E. human activity.

E. human activity.

Explanation:

Human activity has had a negative impact on the species that inhabit the planet. Even many scientists hold the hypothesis of humans we are generating the sixth mass extinction of mass species. Industrial human activities have generated an acceleration in climate change by increasing greenhouse gases, a situation that many species have not resisted resistance. Additionally, the pollution it generates has also caused the death of many species in all types of ecosystems

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b. the carbon cycle ensures living things have a source of hydrogen