Answer:
Spoilage microbes produce acid
Explanation: 
When food becomes spoiled or is unprotected, bacteria will invade the food. These types of bacteria are called spoilage bacteria. The bacteria will multiply by consuming the nutrients from the food and grows very rapidly. In certain conditions, the invading bacteria will produce acids that protects them and creates a barrier for other microbes. This acid is what gives spoiled food a sour taste.
 
        
             
        
        
        
The Biblical flood would have caused the death of all life on earth, except for those on the arc, which would have resulted in fossils that are now found. Fossils being found in different layers of rocks could have been a result of how they settled as the waters receded.
        
             
        
        
        
Answer:
Other species that rely on those fish would die off. The extinction of one species can lead to the extinction of another and so on.
 
        
             
        
        
        
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Hopes this help:)
        
                    
             
        
        
        
Answer:
1. ) Litre - Basic metric unit of volume
2.) Metric system - Used by science and the rest of the world
3.) Gram - Basic metric unit of mass
4.) British system - System of pounds , feet and gallons
5.) Meter - Basic metric unit of length
Hope this helps you