Answer:
A vaccine activates our immune system without making us sick. Many dangerous infectious diseases can be prevented in this simple and uncostful
drug .Vaccines have eliminated some of the most dangerous, fatal diseases in human history.
Answer:
operant conditioning
Explanation:
In operant conditioning, organisms learn to associate events that repeatedly happen together. The word "operant" should be changed to the word "classical." any relatively permanent change in behavior brought about by experience or practice.
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There are seven plate tectonics on Earth.
Phylogenetic
Scientist use a phylogenetic tree to track the evolutionary history of a species.
When your body temp gets too low you begin to shiver. Brining your body temp to a comfortable level will cause it to stop shivering.
