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How mirror can be identified by observing the values of the magnification?

How mirror can be identified by observing the values of the magnification? If an object is placed within the focal length of a mirror, the image of the object will get magnified in case of a concave mirror, and will get diminished in case of a convex mirror. The value of magnification will be greater than 1 in case of a concave mirror, and less than 1 in case of a convex mirror.

Phylum-Porifera

Habit and habitat
The member of the phylum porifera is commonly known as "Sponge'. Their distribution is worldwide i.e. they are found all over the world. Most of the species are marine. But some live in fresh water. Usually they live in colonies.

General characteristics
Simplest multicellular animal.
Body wall with numerous pores. Through these
pores food and oxygen enter into the body.
No compact tissue, organ and organ system,
Example : Spongilla, Scypha.

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