The Cretaceous–Paleogene (K–Pg) extinction event (also known as the Cretaceous–Tertiary (K–T) extinction) was a sudden mass extinction of three-quarters of the plant and animal species on Earth, approximately 66 million years ago.
        
             
        
        
        
Hippocampus
It is a small part of the brain located on the medial temporal love and forms important part of the limbic system, these are the regions that regulates emotions. This is also associated with memory, spatial navigation, consolidation of information. Damage to this area can cause memory loss, difficulty establishing memory . In Alzheimer's disease hippocampus is one of the first regions in the brain to be affected.
        
             
        
        
        
Answer:there is a cell division as it occurs every 20min
 
        
             
        
        
        
Answer:
D. ghost fishing
Explanation:
The nets are also called "ghost nets" being left behind or lost in the ocean by fishermen. 
Also, never leave nets in the water. Our Earth needs healing.