Diffusion is where particles are able to move freely from a high concentration gradient to a lower concentration gradient.
Answer:
C
Explanation:
Vestigiality is the retention during the process of evolution of genetically determined structures or attributes that have lost some or all of their ancestral function in a given species.
Provides us Oxygen, takes away carbon dioxide, contains ozone which protect us from U.V radiations and act as a cold reserviour
A. Any soil on the suspect should be collected and labeled
