Answer:
Oceanic crust and continental crust 
 
        
             
        
        
        
awnser is high concentrations of oxygen
 
        
             
        
        
        
The various types of cells making up the structural composition of your body (skin cells, muscle cells, cells of your stomach lining, etc.) are all Epithelial cells. The only other class of cells in your body are Gametes (sperm and egg cells).
        
             
        
        
        
C) centrioles is correct
All other parts have important functions but only centrioles help with chromosomes
        
             
        
        
        
Answer: The probability of producing offspring with genotype Rr is 100%.
Explanation-
Round seed is a dominant trait ( depicted by dominant R allele) whereas wrinkled seed is a recessive trait ( depicted by recessive allele r). 
According to the law of segregation of genes, the alleles will separate from one another during gamete formation. 
Pea plant with round seeds will produce two gametes that is R and R whereas plant with wrinkled seeds will produce r and r gametes.
When the parents are crossed, they will result in the offspring with genotype Rr ( that will exhibit round seed phenotype). 
Refer punnett square.