#Question id: 9199
#Unit 9. Diversity of Life Forms
Ecosystem services include processes that increase the quality of the abiotic environment. Which of the following processes would fall under this category?
#Question id: 9200
#Unit 9. Diversity of Life Forms
During the inventory of bacterial genes present in the Sargasso Sea, a deep isolated area in the middle of the Atlantic Ocean, a research team concluded that at least 1,800 bacterial species were present. Based on what you might predict about the habitat structure of such an area, what kind of bacterial diversity would you expect to see in tropical coral reef waters?
#Question id: 9201
#Unit 9. Diversity of Life Forms
Erwin and Scott used an insecticidal fog to knock down insects from the top section of a L. seemannii tree. The researchers identified over 900 species of beetles among the individuals that fell. Erwin also projected that this entire tree from top to bottom is host to about 600 arthropod species that are unique to this tree species and not found on any other tree species. There are approximately 50,000 species of tropical trees. Although it could not be entirely accurate, what would be the best way to estimate the total number of arthropod species?
#Question id: 9202
#Unit 9. Diversity of Life Forms
Which of the following statements regarding extinction is accurate?
#Question id: 9203
#Unit 9. Diversity of Life Forms
The human impact that scientists determined has caused the most extinctions on record is ________, and beyond further losses from this impact, the other impact with the largest potential to cause future extinctions is ________.
#Question id: 9204
#Unit 9. Diversity of Life Forms
Which of the following observations provides the best evidence of a biodiversity crisis?