Biology

Biology, 31.07.2019 03:40, Tristabergeron5650

Large amounts of sewage cause a lot of algae to grow, which lowers the concentration of carbon dioxide in the water. *

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Biology, 26.06.2019 11:30, 20170020

Amarine biologist wishes to test the hypothesis that heavy grazing by fish causes the brown alga laminaria to stay short rather than grow upright. which of the following variables could be manipulated successfully at the shore to test this hypothesis? a. add nutrients to the ocean water around the algae to see if it will grow taller b. increase the amount of dissolved carbon dioxide in the water around the algae to see if they grow taller c. place a netted screen around the algae to restrict fish from grazing on the algae and check for any change in growth d. alter the intensity of light to see if this is the cause of the algae’s stunted growth e. protect the algae from ocean waves to see if wave shock is causing the stunted growth

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Geography, 04.07.2019 20:30, hipstergirl225

Algae need nutrients like carbon, nitrogen, and phosphorus, among others, in order to grow. could carbon ever limit algae growth? no. carbon is abundant everywhere and so it can never be a limiting nutrient for algae no. algae are too small to ever require more carbon than what is available in the environment yes. because carbon is needed by algae to grow, it has the potential to limit growth. yes. whenever phosphorus is added to a lake, algae grow and therefore use more carbon as well.

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Advanced Placement (AP), 22.07.2019 00:32, debo4965

Dissolved oxygen (do) levels of 6 ppm were recorded in a lake the day before a sewage spill. three days later, the do levels in the same location were measured to be 0.5 ppm. what is the probable cause of this change in do? a. decreased water temperature caused a decrease in gas solubility. b. decreased turbidity due to the sewage caused an increase in photosynthetic algae. c. decreased oxygen is available due to bacterial decomposition of organic waste. d. decreased carbon dioxide is produced by photosynthetic algae. e. decreased nitrate levels eliminated a source of dissolved oxygen.

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