Answer: <span>Normal microbiota directly kill invading organisms.
Some bacteria that reside in our body are useful to combat pathogenic microorganisms. Those bacteria, like lactobacillus and E.coli, inhibit the growth of those pathogenic organisms by taking, for example, oxygen and nutrients from them, or even changing the local ph. They can also produce metabolites that make the environment impossible to live for the intruders.
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The answer to your question is 2
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Producers are called producers because when they take in carbon dioxide and water, and they produce glucose and oxygen. Animals need oxygen to survive and producers are the reason that all of the animals on earth haven't used up all the oxygen in the atmosphere. We need producers to survive, otherwise the Earth would be carbon dioxide rich and we humans couldn't breath it.
