Match the following drugs with their descriptions. 1. increase the activity of the central nervous system tranquilizers 2. reduce the activity of the central nervous system depressants 3. stop the transmission of pain impulses to the brain and spinal cord by preventing the perception of pain stimulants 4. fight invading bacteria by either slowing their multiplication or by destroying them antibiotics 5. reduce the physical and psychological symptoms of anxiety by reducing brain activity hallucinogens 6. naturally occurring or synthetically produced drugs that can cause hallucinations non-narcotic analgesics

Explanation:

Tranquilizers depress the central nervous system (CNS) and reduce stress, anxiety, tension, fear, agitation, and other disturbances in the mind and put both the mind and body at rest.  

Depressants slow down or inhibit the CNS activities and help to treat anxiety, seizures, insomnia and other psychotic issues.  

Stimulants like cocaine, amphetamines increase the activities of the CNS by triggering the neurotransmitters. Hence affect the body in multiple ways like increasing the heart rate, blood pressure, and respiratory rate; increased mental hyperactivity or alertness even leading to psychosis.

Antibiotics are drugs that prevent spread of infectious diseases by killing the germs like bacteria. They control the multiplication and reproduction and growth of the germs.

Hallucinogens potentially alter the mood and perception of a person and causes hallucinations (visual, auditory etc) which makes one feel or sense unreal things imaginary as real things.

Analgesics (non-narcotic) are drugs taken to control pain or inflammation like the NSAIDs

poor water quality affects most estuarine organisms, including commercially important fish and shellfish. the pollutants that have the greatest impact on the health of estuaries include toxic substances like chemicals and heavy metals, nutrient pollution (or eutrophication), and pathogens such as bacteria or viruses.

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.