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Answer :

Spirulina is a type of blue-green algae that grows in fresh and salt water. They are useful to mankind because:


1. It is full of vitamins like Vitamin B12, Niacin, Riboflavin, Calcium, Potassium and phosphate etc.


2. It has powerful anti-inflammatory and anti-oxidant properties.


OR


Keeping beehives in crop fields has several advantages which are as follows:


1. Keeping beehives in the crop field increases the chances of pollination thereby increasing the crop yield.


2. It also helps in honey production because bees collect nectar from the flowers in the crop and produces honey from it.


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