SCI 225 questions with correct answers graded A+

SCI 225biological species concept - correct answer group of populations whose members have the potential to produce fertile offspring. Species richness - correct answer the number of different species in a community Species evenness - correct answer relative abundance of each species Reasons for more species at equator - correct answer Climate stability, primary productivity How to measure biodiversity - correct answer collection of diff species in particular location long term climate change - correct answer More than 1 million yrs Sedimentary rock shows... - correct answer long term regional climate change Ice core extractions - correct answer Show age, temp in past, atmosphere composition in past Water has two isotopes.... - correct answer 016 and 018 Mass extinctions are shown in - correct answer Fossil records Earth's orbital cycles - correct answer Milankovitch cycles 1) Orbit changes shape-100,000- year cycle. (eccentricity) 2) Axis wobbles (precession)--26,000-year cycle 3) Axial tilt varies from 21.5 to 24.5 degrees--41,000-year cycle (0bliquity)