Question

question 6
listen
what is the primary cause of the formation of dead zones?
a pollution and nutrient runoff leading to excessive algae growth
b overfishing
c introduction of invasive species

Explanation:

Dead zones are areas in water bodies with low oxygen levels. Pollution and nutrient runoff (like from fertilizers) cause algal blooms. When algae die and decompose, oxygen is consumed, creating dead zones. Overfishing affects fish populations but isn't the primary cause of dead zones. Invasive species can disrupt ecosystems but aren't the main cause here.

Answer:

A. Pollution and nutrient runoff leading to excessive algae growth