D. A struggle for existence is apparent.
If a struggle for existence is apparent, natural selection occurs because all of the weak/unfit/unadapted ones die.
        
                    
             
        
        
        
Answer:
False 
Explanation:
because internal fertilisation occurs in most bony fish, many reptiles, some cartilaginous fish, most amphibians, two mammals, and all birds. Reptiles and insects produce leathery eggs, while birds and turtles produce eggs with high concentrations of calcium carbonate in the shell, making them hard.
 
        
             
        
        
        
Hey! The answer is: Collect data using a prototype.
I have a screenshot attached as well.
I hope this helps you!
Good luck! :)
 
        
             
        
        
        
Vegetables are considered among the most nutritious food available because they have a large amount of minerals and vitamins in them.They do not have fat in them which makes is more nutritious.Besides this every part of vegetable can be utilized whether it is in the form of stem,root,leaves,seed all have some amount of nutrition in them.The nutrition present in vegetables can be derived in multiple ways ,they can be eaten raw or can be cooked.Vegetables are very rich source of vitamins and minerals. They are very rich in anti-oxidants ,which protects the body from cancer.They are also a rich source of iron,phosphorous,multivitamin,etc.