There are two broad classes of seismic waves: body waves and surface waves. Body waves travel within the body of Earth. They include P, or primary, waves and S, or secondary, waves. P waves cause the ground to compress and expand, that is, to move back and forth, in the direction of travel.
        
             
        
        
        
Answer:
 Is made up of the living, or biotic, and non-living, or abiotic, components of its surroundings.
Explanation:
 
        
             
        
        
        
Answer is: <span>c. they both connect the two hemispheres.
</span>Corpus callosum<span> is a wide </span>commissure<span> beneath the </span>cerebral cortex<span> in the </span>brains<span> of </span>placental mammals. Corpus callosum <span>connects the left and right </span>cerebral hemispheres <span>and enables communication between the hemispheres.
</span>Interior commissure<span> </span>is a bundle of nerve fibers<span>, connecting the two temporal lobes of the cerebral hemispheres across the midline.</span>
        
                    
             
        
        
        
Answer:
B. Three
Explanation:
Messenger RNA : mRNA  : Encodes amino acid sequence of a polypeptide.
Transfer RNA: tRNA  : Brings amino acids to ribosomes during translation.
Ribosomal RNA: rRNA :  With ribosomal proteins, makes up the ribosomes, the organelles that translate the mRNA.
 
        
                    
             
        
        
        
Hydrogen isotopes deuterium and tritium