Which organism is a producer?

oak tree
mushroom
mountain lion
butterfly

Oak tree is a producer while mushroom is also one but mountain lions and butterflies are booth consumers but if i had to choose between butterfly and oak tree it would be oak tree sorry if i am wrong but this is what i think have a nice day!

Explanation:

the national environmental policy act (nepa) is a united states environmental law that promotes the enhancement of the environment and established the president's council on environmental quality (ceq). the law was enacted on january 1, 1970. to date, more than 100 nations around the world have enacted national environmental policies modeled after nepa.

littering streams           is the answer