It is against some religions to eat meat.
All living beings should be treated equally, they say.
Scientists define life in terms of qualities that living organisms uniquely share:
The biological definition of matter : All living matter must be made of cells (the smallest unit of life,) obtain and use energy, grow and develop, reproduce, respond to their environment and adapt to their environment.
Life begins at the cellular level.
By this definition, even a bacteria is a living organism.
Are plants not living?