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:
a. are a valid way to measure a person's inborn intelligence
Explanation:
IQ testing is an important tool for measuring an individual's innate intellectual abilities, as long as its content is not limited to just one area of knowledge. Cognitive ability is related to hereditary and cultural characteristics that can be inherited or developed throughout life. Over the years, experts have developed techniques for measuring individual intellect.
The tool is used to obtain an intelligence indicator for different purposes. Following the original idea of the test, its application may be necessary to identify children with attention deficit or who are in a more advanced learning process than other students.
The IQ test is also used to diagnose issues related to an individual's behavior and conduct, and to support a job selection process.
 
        
             
        
        
        
The answer is c because of science