why almost everything alive is symmetrical?

Question

I have been thinking why lives are almost all physically symmetrical? For example, mammals appear to be symmetrical - right side of body is identical with the left side of body.

Answer 1

because the face alone has two eyes if you had one eye half a mouth and a nose on one side and the other side was just there what would be the poing of that side.

Answer 2

your thinking is right. These are signs for people thinking about creation. I also wonder why they are created in this manner.
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One of the most striking points producing harmony in the universe is symmetry. Living things have symmetric structures. Anything we see in nature, a seed for instance, a fruit or a leaf we examine will show us symmetry in their structure. Let us take a leafy plant. Leaves wind around the body of the plant like a spiral. This is a certain type of symmetry. Similarly, an observable order rules in the arrangement of the grains of a seed and in the design of the veins of the leaf.
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God created everything in the universe within a larger order. God has control over all things.

Your God is One God. There is no god but Him, the All-Merciful, the Most Merciful. In the creation of the heavens and earth, and the alternation of the night and day, and the ships which sail the seas to people's benefit, and the water which Allah sends down from the sky - by which He brings the earth to life when it was dead and scatters about in it creatures of every kind - and the varying direction of the winds, and the clouds subservient between heaven and earth, there are Signs for people who use their intellect. (Surat al-Baqara: 163-164)

Answer 3

Not everything alive is symmetrical. For example, most unicellular life is not. Even when you get into multicellular organisms, sponges are not symmetrical. Later, radial symmetry (seen in corals, jellyfish, etc.) developed. The first organisms with bilateral symmetry (like humans have) probably developed in the late Proterozoic. In this case, it was probably due to the localization of most sensory organs in one anterior location.