Teach better , make sure we have a good understanding of things
        
             
        
        
        
Producers could not survive without consumers. Produces rely on consumers to purchase their product, if no one buy their product, then the producer has no money to even produce anything. This like a car, the car is the producer, and the gas is the consumer, the car will not work unless there is gas. So a producer will not survive without the consumer.
        
             
        
        
        
I believe the answer is a Meander. (beware that this is actually a geography question not a biology one, please put it in the right section next time and it will be answered quicker!)
        
             
        
        
        
Water is essential to life because it creates us humans, plants, animals, etc. So, if we find water on Mars it would be important because water is essential to life, meaning we would know that there would be some kind of life on Mars because water makes up anything. 
        
             
        
        
        
The correct answer is As oceans get hotter, they release more CO2, which then increases atmospheric and ocean temperatures.  
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Positive feedback<span> is a process which can be explained like this: </span>A produces more of B which in turn produces more of A.</span> <span>In the example above, high-temperature oceans (A) produce CO2 (B) which then make temperature even higher (A).</span>