<span><span>The blood cells containing hemoglobin,  that transports oxygen (O2) to the body tissues of vertebrates, are called red blood cells.</span> Red blood cells (RBCs), are also referred to as red cells, red blood corpuscles, haematids, erythroid cells or erythrocytes<span>, (from Greek erythros for "red" and kytos for "hollow vessel"..RBCs take up oxygen in the lungs and release it into tissues while squeezing through the body's capillaries.</span></span>
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Answer:
a. purple allele (C) = 0.609, pink allele (c) = 0.391
b. purple homozygotes = 371, pink homozygotes = 153, heterozygotes = 476
Explanation:
Given - 
Purple flowers - 847
Pink flowers - 153
The frequency of recessive genotype i.e 

Frequency of recessive allele i.e q is equal to 

As per hardy Weinberg's first equilibrium equation - 

Frequency of purple homozygous species 

Number of purple homozygous species 
Number of pink homozygous species 
Heterozygous species is equal to 

 
        
                    
             
        
        
        
 C. The nervous system sends signals to make muscles move. 
 
        
             
        
        
        
Answer: the two tropics zones
Explanation:
Between the two tropics zones, which includes the equator, the Sun is directly overhead twice per year. Outside the tropic zones, whether to the south or north, the Sun is never directly overhead. Two other significant lines of latitude are the Arctic Circle (around the North Pole) and the Antarctic Circle (around the South Pole).
 
        
             
        
        
        
You use your lungs to take deep breaths and it calms all your nerves
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