Explain the difference between Ehrlich's rivet theory and Walker's theory of the importance of biodiversity
What will be an ideal response?
Ehrlich's theory states that all species are fairly equal in their importance to the ecosystem and the ecosystem will fail after the removal of species places a sufficient strain on the system. Walker's theory states that there are certain keynote species, which, if removed, severely damage the health of the ecosystem. Under this philosophy, it does not necessarily matter how many species you remove – it is more important which species are removed from the ecosystem.
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Bottled water is a sustainable alternative to tap water.
Answer the following statement true (T) or false (F)
The smallest marine mammal is a ________.
A. dugong B. sea lion C. fur seal D. sea otter E. seal
As they formed, due to their high temperatures and comparatively weak gravitational fields, which planets were unable to retain appreciable amounts of hydrogen, helium, and ammonia?
A) Neptune and Uranus B) Mercury and Earth C) Jupiter and Uranus D) Jupiter and Neptune E) Uranus and Pluto
Which of the following will be most impacted by President Obama's first climate change policy?
- coal-fired power plants - auto industry - ethanol industry - liquid propane companies