Which statement describes the relationship between oxygen in rivers and environmental factors? 

A)  The amount of oxygen in rivers increases as the water temperature falls. 
B)  The amount of oxygen in rivers increases as the water temperature rises. 
C)  Oxygen dissolved in rapidly flowing rivers is replaced slowly. 
D)  The amount of oxygen in rivers increases in dry seasons.

Environmental Factors

Elements of the surrounding environment that can influence living organisms or ecological systems.

Oxygen

A chemical element with symbol O, essential for most forms of life on Earth, involved in cellular respiration and a component of the air.

Water Temperature

A measure of the warmth or coldness of water bodies, which affects aquatic life, water quality, and the global climate system.