Which condition is a biotic factor of an aquarium ecosystem?
o amount of oxygen in the water
temperature of the water
o
algae growing on the glass
o
gravel on the bottom of the aquarium

What is true of all organisms in the kingdoms protista, plantae, fungi, and animalia? a. they are multi-celled. b. they are photosynthetic. c. they have cells that contain membrane-bound organelles. d. they contain cells that lack membrane-bound organelles.

Individuals do not compete directly for resources, but are prey for the same predator

Which of the following produces carbon dioxide? a. plants b. animals c. decomposers d. all of the above