Central nervous system. and automatically nervous system .it is mainly spinal cord system of the body.
        
             
        
        
        
Haploid means half, and diploid means double of the half, and so its diploid number will be 20⋅2=40 if its haploid number is 20 .
        
             
        
        
        
Your answer is B. It can reproduce quickly. I took a test that had this question and I got this one right. Please mark brainliest.
 
        
             
        
        
        
Answer:
A. increase in American pika population size 
Explanation:
Carrying capacity is the idea that relates to how much population can an environment sustain before collapsing. Here, the answer would be A. increase in American pika population size  because if you increase the food for weasals, naturally the population carrying capacity goes up because now the environment has food to feed the weasals which can contribute to increasing the carrying capacity (i.e. the environment can now handle larger population of weasel than initial condition)
 
        
             
        
        
        
Answer:
Whether the stain comes out or not.
Explanation: