The heart has 4 chambers.
        
                    
             
        
        
        
The life cycle stages of a plant would be seeds → germination→growth→maturity→pollination→fertilisation→seeds   etc etc.
so I would say the life cycle stages not found in animals would be either pollination or germination.
        
             
        
        
        
Cells require a structure that regulates the transfer of material in and out of the cell. This structure is the –
Cell membrane.
        
             
        
        
        
Answer: Abruptio<span> placentae;  Placenta Previa </span> 
Abruptio<span> placentae or placental abruption is the premature separation of the placenta from the uterus.   Individuals having this abruption of the placenta experiences bleeding, uterine contractions, and fetal distress.</span>
Placenta Previa, on the other hand, occurs when the placenta lies low in the uterus and partially or completely <span>covers the cervical opening (cervix)</span><span>. </span>