Question

freshwater biomes
abiotic factors
nutrients (think: \food\) are important abiotic factors in freshwater biomes. phosphorus and nitrogen are the two most important nutrients impacting these biomes.

both nitrogen and phosphorus are found naturally in freshwater, but in very low amounts. if there is a sudden inflow of either--or both--of these nutrients, an algal bloom may occur. eventually, this can present a major problem.

if too much nitrogen and/or phosphorus enters a freshwater biome, what negative result may occur?

a fish overload
an algal bloom
clearer water

Explanation:

The text explains that excessive nitrogen and/or phosphorus in freshwater biomes can cause an algal bloom. "A fish overload" is incorrect as algal blooms often harm fish, and "clearer water" is wrong as algae would cloud water. So the correct option is the one about algal bloom.

Answer:

B. an algal bloom (assuming the option with "an algal bloom" is labeled as B; if the original options had different labels, adjust accordingly. Based on the given options, the correct one is "an algal bloom".)