Insulin is released into the blood when oxygen levels are low and blood glucose levels are high 
        
             
        
        
        
Answer:
C. 1/4
Explanation:
Let's assume that the allele for the spotted coat is "S" and the one for the even coat is "s". The allele "L" gives short horns while the recessive allele "l" imparts long horns. The genotype of the cattle heterozygous for both traits would be SsLl. A cross between two heterozygous cattle would produce progeny in following phenotype ratio= 
9 spotted coat and short horns: 3 even coat and short horns: 3 spotted coat and long horns: 1 even coat and long horns. 
Therefore, the proportion of the progeny with long horns = 4/16= 1/4
 
        
             
        
        
        
Answer:
Even in a chemical reaction when atoms interact and create new products, mass is conserved. This is because the new substances created are composed of atoms that were present in the reactants. The atoms from the reactants come apart, rearrange, and re-bond in a different arrangement to form the products.
 
        
             
        
        
        
Answer:
C. It portrays evolutionary change as a smooth curve.