Question

1. which of the following factors is not an important advantage for aquatic organisms living near the surface of a lake or pond? mark only one oval. a. warmer temperature b. more sunlight c. presence of decomposing organisms d. higher oxygen level 12. which of the following is not a characteristic of salt marshes and mangrove swamps? mark only one oval. a. both provide habitats for wildlife b. both are dominated by marsh grasses c. both are found along coastal areas d. both are threatened by development 13. photosynthetic organisms are found mainly in shallow water due to the availability of mark only one oval. a. oxygen b. nutrients c. sunlight d. salt 14. in the ______ zone, aquatic life is diverse and abundant. mark only one oval. a. benthic b. eutrophic c. littoral d. plankton 15. which of the following is not a threat to coral reefs? mark only one oval. a. oil spills b. sewage c. pesticides d. phytoplankton

Explanation:

1. Decomposing organisms near the surface can consume oxygen and release harmful substances, which is not an advantage for aquatic organisms. Warmer temperature, more sunlight and higher oxygen level near the surface are beneficial.
2. Mangrove swamps are dominated by mangrove trees, not marsh grasses. Both provide habitats for wildlife, are found along coastal areas and are threatened by development.
3. Photosynthetic organisms need sunlight for photosynthesis, and shallow - water has more available sunlight.
4. The littoral zone is the area near the shore of a body of water where aquatic life is diverse and abundant.
5. Phytoplankton are a part of the normal marine ecosystem and are not a threat to coral reefs. Oil spills, sewage and pesticides can damage coral reefs.

Answer:

1. C. presence of decomposing organisms
2. B. Both are dominated by marsh grasses.
3. C. sunlight
4. C. littoral
5. D. phytoplankton