Answer:
Graptolites lived from the Cambrian Period, about 510 million years ago, disappearing in the Carboniferous Period, around 320 million years ago.
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Answer:
the answer is c, polarity of water molecules
Explanation:
 
        
             
        
        
        
Parasitism
Explanation:
This relationship in which the heartworms gets nutrient from the host and in the process, the host eventually dies from infestation is known as parasitism. 
- The organism that houses the heartworm is called the host 
- The heartworm in itself is called the parasite. 
- Parasitism is a positive - negative relationship in which one organism feeds on the other and causes harm to it in the process. 
- Plasmodium falciparum is the parasite of malaria in man. 
- In commensalism, one organism depends on the other without causing harm to it. Example is cattle and egret. 
- Mutualism is a positive - positive relationship in which both organism derives benefits from the other. Example is lichen. 
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