Walden Pond Which statements describe the Walden Pond ecosystem?

It has the same amount of oxygen near the surface as it
does at at bottom.

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

i hope this

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.

wegner's theory did not explain how the continents could move

explanation:

i would answer but it has no question attached to be answer sorry kido