Answer:
Option A
Explanation:
Most of the human economic systems if not all operate with the human natural systems. Human economic system and natural systems almost dependent on one another in that they are linked by a network of interconnected  processes; for example, human economic activity depend on natural, including a maintained system of primary productivity such as forests and agriculture etc.
 
        
             
        
        
        
The Rat’s whiskers are highly sensitive to touch, they brush over the ground, obstacles, food, and other rats. When they bend, it’s follicles send messages to the rat’s brain.
The Rat’s incisors are the four long, sharp front teeth, they use them for gnawing and for grinding food prior to swallowing it.
        
             
        
        
        
The CPT code that should be reported by the obsterician is 76816.
CPT codes used for obstetrician ultrasound ranges from 76801 to 76821. The description of the codes is based on the procedures that are carried out.
CPT code 76816 is used to bill a follow up study. The medical examination perform in this case include: re-assessing the size and the interval growth of the fetus and examination of abnormality previously observed on previous scan. <span />
        
             
        
        
        
Male- private parts are different, Males have sperm that contributes to the reproduction process, males give 23 chromosomes like female's
Female- private parts are different, female's contributes eggs to the reproduction process, female's give 23 chromosomes like male