Answer:
because during the measurement of the fetus, the fetus shows 40%  of its natural length
Explanation:
The total length of each fetus is multiplied by 2.5 to obtain the actual length because during the measurement of the fetus, the fetus shows 40%  of its natural length
 
        
             
        
        
        
Iris is the muscle that regulates the amount of light entering the eye
        
             
        
        
        
Answer:
Due to its thin width and elasticity.
Explanation:
A jumping rope could be used to model the cell membrane of a plant cell because of their elasticity that acts like cell wall or cell membrane of the cell. Just like a cell wall or cell membrane which is the outer covering is thin in width and has the ability to elasticity so the jumping rope is also used in the model due to its elasticity and thin width so that's why we can used it in the cell model.
 
        
             
        
        
        
I'm not sure how in depth of an answer you need here, but it uses sunlight (or energy from sunlight) to create food (Sugar is the food I think) from carbon dioxide and water. But that is the basics of what happens in Photosynthesis.