Select reasons why euglena have in the past been classified as protozoans. They have no cell wall.
They have a pellicle.
They are motile.
They have food vacuoles.

Which would best keep the oxygen cycle stable? a. cutting down jungles to create farmland b. eliminating parks in large cities c. dumping toxic chemicals into the ocean d. reducing the amount of deforestation d. reducing the amount of deforestation