Ahealthy environment depends on biogeochemical cycles maintaining a balance of input and output. high levels of nitrogenous compounds in the waterways can cause an algal bloom. how does an algal bloom affect a marine ecosystem?

This should be the omitted answer choices to the question:

a. It decreases the carbon dioxide in the water, creating a toxic environment.

b. It decreases oxygen in the water, creating a toxic environment.

c.It increases the carbon dioxide in the water, stimulating plant growth.

d. It increases the oxygen in the water, stimulating plankton growth.

b. It decreases oxygen in the water, creating a toxic environment.

Explanation:

A rapid increase in algae populations in a marine ecosystem as a result of high levels of nitrogenous compound would result in increased level of dead organic matters from algae. This would mean more food for bacteria that are present in the marine ecosystem, which would further lead to the rapid increase in the population of bacteria in the marine ecosystem. The presence of more dead organic matters would favor the surge in the population of bacteria. Bacteria require oxygen to survive. As the population of bacteria increases rapidly, the level of dissolved oxygen in the water would drop as bacteria would make use of most of the dissolved oxygen available, thereby disrupting the ecosystem of the marine habitat.

The survival of most aquatic organisms is dependent on the level of dissolved oxygen available as most aquatic fish and insects would die as the level drops. Some species of algae produce toxins which also harmful to aquatic life.

Alga bloom would affect a marine ecosystem by reducing the level of dissolved oxygen needed by other aquatic organisms to survive, and also leads to high level of production toxins detrimental to other aquatic organisms.

the bullets go in this order.

4, 1, 3, 5, 2

answer and explanation;

volcanic rocks are igneous rocks which form from lava, molten rock which has been thrust out of a volcano onto the surface of a rocky body such as an asteroid, planet, or dwarf planet.  

plutonic rocks are igneous rocks which form from subterranean chambers of molten rock or magma. plutonic rocks make up the base of continental crust as well as oceanic crust. their slow rate of formation causes them to be coarse grained since there is plenty of time for large crystals to form before the magma solidifies into rock.

the textural difference is that plutonic rocks are more coarse grained than volcanic rocks. plutonic rocks are coarse grained while volcanic are fine grained ; glassey or fragmental. since fine and coarse are adjectives the decision as to whether a rock is fine or coarse grained is generally made on the bases of whether or not the individual crystals can be seen in most if the rock.