13. In a natural community, what will likely cause a disruption or imbalance among species?
A. overpopulation
C. introduction of a foreign species
B. removal of a predator
D. all of the above
14. Which of the following sequences represents the hierarchy of biological organization from the least complex to the most complex level?
A. organ, organism, tissue, organelle, molecule
B. organelle, tissue, biosphere, ecosystem, population
C. organism, community, biosphere, molecule, tissue, organ
D. organism, population, community, ecosystem, biosphere
15. Which of the following statements is FALSE?
A. Tissues exist within organs which exist within organ systems.
B. Communities exist within populations which exist within ecosystems.
C. Organelles exist within cells which exist within tissues,
D. Communities exist within ecosystems which exist in the biosphere.​