Ecologists have traditionally categorized the roles of organisms in ecosystems into three broad categories that include
A. symbionts.
B. decomposers.
C. carnivores.
D. parasites.
Answer: B
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Zimbabwe's igneous intrusion that contains most of its mineral wealth is called the
A. Iron Range B. Great Mountain C. Great Mine D. Great Dyke
Complex computer simulations of the variables affecting climate are called ____
a. Milankovitch Programs b. Global Climate Abstracts c. Prehistoric Atmosphere Computers d. Global Circulation Models e. Virtual Planet Codes
Why is productivity low in tropical regions?
A) because the deep waters are too warm to maintain a healthy biomass B) because the thermocline acts as a barrier to the mixing of surface and deep waters C) because there is too much sunlight D) because the low density of the water makes it hard for plankton to float near the surface E) All of the above are problems.
________ is the rising of cold water from deeper layers to replace warmer surface water.
A) Upwelling B) Contraction C) Wave refraction D) Sublimation