OCN 105 Exam 1 Questions with Correct Answers Latest Update 2025
Origin of Earth - Answers Jan 1
Moon formation - Answers Jan 8
Earliest bacteria/algae - Answers April 5
Buildup of free oxygen in atmosphere - Answers May 31
Earliest fish - Answers Nov 23
Frist Dinosaur - Answers Dec 14
Dinosaur extinct - Answers Dec 26
Early horses - Answers Dec 27
Early primates - Answers Dec 27
Modern man - Answers Dec 31
Keeling curve - Answers -showing atmospheric carbon dioxide level increase at faster rate each year
-long term trend
-annual cycle
measuring CO2 since - Answers 1958
understanding patterns in past climate records is essential for demystifying environmental history -
Answers -timer series analysis looks for basic characteristics
-trends, periodicity, outliers, abrupt changes, changes in variance
in-phase - Answers both time series increase and decrease simultaneously
periodically - Answers happens on a fixed schedule or intervals
anti-phase - Answers Top time series exhibits a peak, the bottom time series exhibits a low peak
increasing variability - Answers no serious extreme trend but increase in value over years
Earth in long-term cooling trend for - Answers 50 million years ago
amplitude of climate fluctuations has increased. When? and how get data? - Answers -beginning around
6 million years ago
-obtain through ocean
, massive climate changes were driven by - Answers tectonics
Amasia - Answers next super continent
cooling lead to drying - Answers -forests shrank
-grasslands expanded
savannah - Answers open tropical ecosystems composed of grasses and sedges
open tropical ecosystems - Answers composed of grasses and sedges
two major trends in global climate over past 50 million years - Answers -overall decrease in temperature
-larger degree of climate fluctuation over time
Three possible outcomes of population evolution in response to environmental dynamics - Answers -
move and track habitat change geographically
-adapt by genetic change and select structures and behaviors that can be used to cope with new habitat
-became extinct due to inability to relocate to favored habitat
primate population - Answers came down out of the trees and encountered new selection pressures of
the savanna
evolutionary pressure in African savannah - Answers -need to move greater distance across the more
open landscape
-greater risk of predation and harder time finding adequate food
pressure selected hominin - Answers walking upright and having bigger brains
Savanna hypothesis - Answers long-term trend towards increase aridity and the expansion of the
savanna was major driver of hominin evolution
Lake Turkana - Answers -worlds largest permanent desert lake
-wave-cut notches higher up from lakes shore
-rounded pebbles reflecting wave washing
-most fossil record of early humans
Homo erectus - Answers 1.9 and 1.6 million years ago appeared
Australopithecus afarensis vanished and group Paranthropus and Homo appeared - Answers connected
with climate swings
Origin of Earth - Answers Jan 1
Moon formation - Answers Jan 8
Earliest bacteria/algae - Answers April 5
Buildup of free oxygen in atmosphere - Answers May 31
Earliest fish - Answers Nov 23
Frist Dinosaur - Answers Dec 14
Dinosaur extinct - Answers Dec 26
Early horses - Answers Dec 27
Early primates - Answers Dec 27
Modern man - Answers Dec 31
Keeling curve - Answers -showing atmospheric carbon dioxide level increase at faster rate each year
-long term trend
-annual cycle
measuring CO2 since - Answers 1958
understanding patterns in past climate records is essential for demystifying environmental history -
Answers -timer series analysis looks for basic characteristics
-trends, periodicity, outliers, abrupt changes, changes in variance
in-phase - Answers both time series increase and decrease simultaneously
periodically - Answers happens on a fixed schedule or intervals
anti-phase - Answers Top time series exhibits a peak, the bottom time series exhibits a low peak
increasing variability - Answers no serious extreme trend but increase in value over years
Earth in long-term cooling trend for - Answers 50 million years ago
amplitude of climate fluctuations has increased. When? and how get data? - Answers -beginning around
6 million years ago
-obtain through ocean
, massive climate changes were driven by - Answers tectonics
Amasia - Answers next super continent
cooling lead to drying - Answers -forests shrank
-grasslands expanded
savannah - Answers open tropical ecosystems composed of grasses and sedges
open tropical ecosystems - Answers composed of grasses and sedges
two major trends in global climate over past 50 million years - Answers -overall decrease in temperature
-larger degree of climate fluctuation over time
Three possible outcomes of population evolution in response to environmental dynamics - Answers -
move and track habitat change geographically
-adapt by genetic change and select structures and behaviors that can be used to cope with new habitat
-became extinct due to inability to relocate to favored habitat
primate population - Answers came down out of the trees and encountered new selection pressures of
the savanna
evolutionary pressure in African savannah - Answers -need to move greater distance across the more
open landscape
-greater risk of predation and harder time finding adequate food
pressure selected hominin - Answers walking upright and having bigger brains
Savanna hypothesis - Answers long-term trend towards increase aridity and the expansion of the
savanna was major driver of hominin evolution
Lake Turkana - Answers -worlds largest permanent desert lake
-wave-cut notches higher up from lakes shore
-rounded pebbles reflecting wave washing
-most fossil record of early humans
Homo erectus - Answers 1.9 and 1.6 million years ago appeared
Australopithecus afarensis vanished and group Paranthropus and Homo appeared - Answers connected
with climate swings
