<span>In cases of obsessive-compulsive disorder (OCD), compulsions frequently accompany obsessions and appear to serve the function of reducing the anxiety created by such disturbing thoughts.
Compulsions are repetitive physical actions or behavior that are repeatedly performed in order to lessen the stress caused by anxiety from obsessions.</span>
1 is false, waves can't propagate in a vacuum.
If colonists mistreated natives in any way, treating them as less than human, that would indeed inflame the native population, leading to increased tension between the two groups. This problem, when not solved, has led to revolts and few colonies.
Explanation:
The hierarchical structure within a biosphere can be represented as biological levels of organization of living things arranged from the simplest to most complex are:
Organelle, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystem, and biosphere.
