Photosynthetic organisms are usually

Producers

Explanation:

In an ecosystem, a species which is able to produce food for itself and others is known as producers.  

All green plants and other auto-trophic organism that consists of photosynthetic pigments have the capability to entrap sunlight and convert it into chemical energy (within the food).

Thus, all organism that have photosynthetic pigment are able to produce food and hence are known as producer.

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.

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