Answer:
Option B, Rr pp × rr Pp
Explanation:
Given 
Walnut Comb is produces when  one dominant allele R is present at one gene locus and at least one dominant allele P is present at a second gene locus - R* P*
Rose Comb - at least one dominant allele is present at the first locus and two recessive alleles are present at the second locus - R* pp
Pea comb - two recessive alleles are present at the first locus and at least one dominant allele is present at the second  - rr P*
Single comb - two recessive alleles are present at the first and the second locus  - rrpp
Parent are rose combed and pea combed
For being rose genotype must be R* pp 
and for being pea combed genotype must be rr P*
Rr pp x rr Pp
will  produce 
Walnut comb  with genotype Rr Pp
Single comb  with genotype rrpp
and pea comb  with genotype rrPp
Hence, option B is correct
 
        
                    
             
        
        
        
Soil nutrients are important to photosynthesis because they <u>help with chlorophyll </u><u>formation</u><u>.</u>
 
        
             
        
        
        
Answer:
The vacuole. Large in plant cells but small in animal cells
 
        
             
        
        
        
Answer:
GENE
Explanation:
The functional segment of the DNA that contain instructions for a specific trait is known as a gene. 
 
        
             
        
        
        
Answer:
<u> C) Each type of sensory receptor responds only to the stimulus that defines the receptor</u>
<u></u>
Explanation:
Neurons,  specialized cells within the nervous system. These help with coordinated movement ad communication within the body through the transmission of electrical signals.
Sensory receptors are highly specialized neurons. These are able to detect various chemical and physical stimuli, and are classified by their ability to detect certain stimuli such as:
- photoreceptors
- mechanoreceptors
- chemoreceptors
- thermoreceptors
Sensory receptors respond to certain intensities of stimuli, instead of one specific stimulus. e.g. Mechanoreceptors within the skin can respond to pressure changes due to touch, but may also detect sound due to specific vibrations.