Spontaneous generation was a (refuted) theory that some forms of life can arise from inorganic matter. 
Louis Pasteur refuted it in a series of experiments, in which he boiled different matter (grape juice, broth) which would kill all the bacteria and let it stay for a long time to see if it would develop life (he also had a control condition in which he let the boiled liquid interact with the outside words, and those would develop bacterial life). 
        
             
        
        
        
Answer:
A. single-gene
Explanation:
It is controlled by a single gene that has two alleles. The allele for a widow's peak is dominant over the allele for a hairline with no peak.
 
        
             
        
        
        
Wind is the most common cause of erosion in deserts.
        
                    
             
        
        
        
Answer:
C. Releases hormones to regulate the endocrine system
Explanation:
 
        
             
        
        
        
Answer:
Chromosomes can exchange genetic information during a process called "crossing over." This occurs when homologous chromosomes are lined up in pairs. This recombination of maternal and paternal genetic material is a key feature of meiosis.
Explanation:
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