Moon is the shadow that is going across the sun during the solar
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Ribosomes are macromolecular machines, found within all living cells, that perform biological protein synthesis. Ribosomes link amino acids together in the order specified by the codons of messenger RNA molecules to form polypeptide chains.
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Urinary system /Renal/urinary tract maintain fluid and electrolyte balance, purify blood and excrete liquid waste (urine)
Integumentary system exterior protection of body and thermal regulation
Skeletal system structural support and protection, production of blood cells
Hope this helps there is 3 of them
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nucleic acid - nucleotides
The term " basic unit of matter" refers to an atom.
The atom consists of a dense central nucleus surrounded by a cloud of negatively charged electrons. The atomic nucleus contains a mix of positively charged protons and electrically neutral neutrons except in the case of hydrogen which is considered the only stable nuclide with no neutrons.
The electrons of an atom are bound to the nucleus by electromagnetic force. Two or more atoms can be bound to each to form a molecule.