One example of passive transport is diffusion, when molecules move from an area of high concentration (large amount) to an area of low concentration (low amount). Molecules are said to naturally flow down their concentration gradient
 
        
             
        
        
        
Crossing over occurs but on in meiosis 1
        
             
        
        
        
Answer:
It is the Endocrine System.
Explanation:
The Endocrine System controls and regulates almost all the hormones in your body.
Integumentary System = Skin Tissues
Excretory System = Release of Waste out of the Body
Digestive System = Breakdown of Food
 
        
             
        
        
        
Meiosis is the cell division needed to reproduce sexually, it produces the egg and sperm cells, which need to have half the amount of chromosomes, so that when they combine, they have the usual 46 chromosomes. All the other division, which produces identical cells of 46 chromosomes is called mitosis.
So the correct answer is:
<span>D)The number of chromosomes remains the same in mitosis and is reduced by half in meiosis.</span>
        
                    
             
        
        
        
Bipedalism is a form of terrestrial locomotion where an organism moves by means of its two rear limbs or legs. 
(ostrich, human etc. )