Why are there so few ecosystems with more than four levels of consumers?
A) Biomass decreases by about 90% at each trophic level, moving upward.
B) Top consumers compete with and kill each other with increasing population size.
C) Consumers at these highest trophic levels typically form social groups that stop reproducing at high densities.
D) Predators at the highest trophic levels simply are not intelligent enough to hunt other top predators.
A
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In the discontinuous reaction series, which mineral forms as a result of reaction between olivine and the rest of the magma?
a) More olivine b) Pyroxene c) Amphibole d) Biotite e) Potassium feldspar
Looking at the map (Figure 13.13), which Western state has the most Uranium deposits?
A) Colorado B) Arizona C) Nevada D) Wyoming
The composition of the Earth's inner core is thought to be ________.
Fill in the blank(s) with the appropriate word(s).
Some accreted terranes were microcontinents similar to present day New Zealand.
Answer the following statement true (T) or false (F)