Building blocks of life

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Possible Answers:

CELLS.

Last seen on: USA Today Crossword – Mar 13 2022

Random information on the term “Building blocks of life”:

Non-cellular life, or acellular life is life that exists without a cellular structure for at least part of its life cycle. Historically, most (descriptive) definitions of life postulated that an organism must be composed of one or more cells, but this is no longer considered necessary, and modern criteria allow for forms of life based on other structural arrangements.

The primary candidates for non-cellular life are viruses. Some biologists consider viruses to be organisms, but others do not. Their primary objection is that no known viruses are capable of autonomous reproduction: they must rely on cells to copy them.

Engineers sometimes use the term “artificial life” to refer to software and robots inspired by biological processes, but these do not satisfy any biological definition of life.

The nature of viruses was unclear for many years following their discovery as pathogens. They were described as poisons or toxins at first, then as “infectious proteins”, but with advances in microbiology it became clear that they also possessed genetic material, a defined structure, and the ability to spontaneously assemble from their constituent parts. This spurred extensive debate as to whether they should be regarded as fundamentally, organic or inorganic — as very small biological organisms or very large biochemical molecules — and since the 1950s many scientists have thought of viruses as existing at the border between chemistry and life; a gray area between living and nonliving.

Building blocks of life on Wikipedia