Question

what is the biodiversity crisis?
a animals in various ecosystems are wiping each other out due to lack of access to food
b there is an accelerated reduction in the variability of species on earth
c over time, the earth is moving further away from the sun, meaning there is less energy the earth
d communities of organisms are shifting from aquatic to terrestrial (land) areas, causing there to be less space and resources for existing terrestrial organisms

Explanation:

• Option A: Predation/competition for food is natural, not the biodiversity crisis.
• Option B: Biodiversity crisis refers to rapid loss of species variety (variability) on Earth, matching this.
• Option C: Earth - Sun distance change isn't related to biodiversity.
• Option D: Organism community shifts between aquatic/terrestrial aren't the core of biodiversity crisis.

Answer:

B. There is an accelerated reduction in the variability of species on Earth