Productivity of an ecosystem is best calculated by determining the
A) total amount of biomass in the system.
B) number of individuals of each species.
C) number of species present in the ecosystem.
D) total photosynthesis per unit area each year.
D
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Blight fungus kills U.S. chestnut trees because the trees ________
A) have not matured long enough to survive B) release the fungus in the leaves that fall to the ground and the fungus is absorbed in the soil C) are hosts to the vectors of the fungus D) have not coevolved with the fungus E) release the fungus into the soil and it is drawn up in the roots
How many amino acids have acidic side chains?
A) 1 B) 2 C) 3 D) 4
Which of the following elements would have been the first to form after the formation of the universe?
A) Lithium and carbon B) Helium and phosphorous C) Hydrogen and helium D) Iron and magnesium
The first bacteria probably used ________ instead of water as a source of hydrogen
A) Fe3O4.OH B) H2SO4 C) H2S D) OH-1 E) HCl