BIO 150 Final Exam Gobetz Correct 100%(RATED A+)

What is a population? - ANSWER interbreeding of a group of individuals who have the same species, geographics and time period. The population is exchanging genes What is the purpose of variability within a pop? - ANSWER some genetic variants have advantages and natural selection can act on variation Two process that can occur if a pop. cant exchange genes - ANSWER genetic divergence and speciation Decreasing variation in a species leads to- - ANSWER instability 3 levels of biodiversity - ANSWER 1. genetic diversity 2. species diversity 3. ecosystem diversity What is being measured as biodiversity? - ANSWER species richness and species evenness species richness - ANSWER the number of different species in a community species evenness - ANSWER the relative proportion of different species in a given area what is richness and evenness? - ANSWER diversity index What has a higher biodiversity? - ANSWER small animals and the tropics, greater geographic variation What is a novel ecosystem? - ANSWER A system of abiotic, biotic, and social components that, by virtue of human influence manifest novel qualities without intensive human management How much of Earth is now a novel ecosystem? - ANSWER 75% ecosystem services - ANSWER The goods and services that ecosystems provide to humanity Human causes of biodiversity - ANSWER pollution, land use change, introduced invasives and exploitation of resources Global cause of biodiversity - ANSWER climate change traits of invasive species - ANSWER tend to be aggressive/adaptive introduced for a purpose outcompete natives sometimes dont have predators What did Charles Darwin study on the Galapagos Islands? - ANSWER tortoises and their shells