Discuss three lines of evidence that provide paleoclimatic data showing when glaciations started and ended. What will be an ideal response?
1. Planktonic foraminifera indicate cooling or warming by changing their coiling direction,
changing their habitat range, and by changing the oxygen isotope ratios of their shells.
2. Pollen grain analysis reveals which type of plants existed at certain times.
3. Tree ring data allows reconstruction of historical environments.
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What lifestyle choice does Gandhi's principle of enoughness address and how does it help the environment?
What will be an ideal response
Which of the following elements is the most stable from a nuclear point of view?
A) iron B) hydrogen C) argon D) uranium E) All are equally stable.
The earliest organic reefs are known from the Ordovician Period
a. True b. False
According to the International Union for Concerned Scientists in 2014, groups showing highest extinction risk are
A) cycads and conifers. B) birds, amphibians, and freshwater fish. C) corals and freshwater crabs. D) invasive species in general.