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Animals (Support (Most animals are invertebrates and are animals without…

- - - - Fertilization occurs when the sperm penetrates the egg to form a fertilized egg called the zygote.
        
        Fertilization can be internal or external.
        
        Internal Fertilization occurs when the sperm and the egg combine inside the animals body.
        
        External Fertilization occurs when egg and sperm combine outside the animals body
        
        Maha al hamlan
- - - - -the structure or form of an animal’s mouth parts determines how its mouth functions.
        
        -after obtaining their food, animals must digest it
        
        -some animals, such as sponges, digest their food inside specific cells.
        
        -others, such as earthworms and humans digest their food in internal body cavities or organs
        
        Layan AlZamil