1. The salt marsh system is dominated by:
a. carnivores
b. herbivores
c. secondary consumers
d. decomposers
2. which of the following nutrients is most closely linked to the energy cycle in ecosystems?
a. carbon
b. nitrogen
c. lead
d. sulfur
3. which biome contains the largest tree species in the world/
a. coniferous forest
b.deciduous forest
c. tropical forest
d. arctic forest
4. the dominant autotrophs of the open water are:
a. phytoplankton
b. kelp
c. seagrass
b. stromatolites
5. herbaceous vegetation such as reeds, sedges, grasses, and cattails typically grow in freshwater:
a. marshes
b. swamps
c. riparian woodlands
d. peatlands or mires
6. what is the main form of photosynthetic life in the limnetic zone?
a. phytoplankton
b. floating species
c. emerging species
d. submergent species
7. the end of the Permian period was characterized above all by a mass extinction of:
a. shallow=water marine invertebrates
b. dinosaurs and other large reptiles
c. small mammals
d. large mammals
8. which of the following is NOT a greenhouse gas?
a. N2O
b. CO2
c. CH4
d. N2