1 Why are protozoans known as the important link for aquatic food chain?
2 Most of the preservatives are chemicals still we use them in our food to preserve?

Dear Student

The preservatives are used in foods to preserve them for long time without any damage. Consuming them do not cause any harm to our body. The preservatives used may be natural or artificial. For long term preservation, artificial preservatives are used. Natural preservatives can be salt and acidic fruits such as lemons can be used.

P.S.  Kindly post separate questions in separate threads.

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