The green world hypothesis was tested by Robert Paine and he found that when you removed the top predator, star fish, from the intertidal zone Group of answer choices:    • None of the answers are correct • species diversity stayed the same • species diversity increased • species diversity decreased

Species richness of many taxa (birds, trees, etc.) increases from the poles to the equator. Ecologists do not know exactly why, but the following idea(s) is/are well supported by evidence: Question 11 options: - The warmer climates of the tropics have longer growing seasons, more primary productivity and more benign climates which produce a larger resource base for more species and may increase specialization. - Polar and temperate regions have had to “start over” many times after successive glaciations, so species have had to re-colonize those areas. - Extinction rates are lower in tropical areas than temperate areas. --- First and Second Answers are BOTH true. --- Second and Third Answers are BOTH true

Match the following succession terms to the correct description. primary succession [Choose ] secondary [Choose ] succession pioneer species [Choose ] severe disturbances [Choose] ◆ ◆

How does extirpation differ from extinction? Group of answer choices Extinction and extirpation are the same thing. Extirpation is the loss of a single population, while extinction is the loss of an entire species. Extinction only happens during a mass extinction. Extinction is the loss of a single population, while extirpation is the loss of an entire species.