Robert Hooke is the first person to observe cells as microscopic structures.
He was of British descent and, fun fact, he discovered cells by looking at a sliver of cork under a microscope lens (although the 'fun fact' is heavily simplified).
Each group of three nucleotides encodes one amino acid. Since there are 64 combinations of 4 nucleotides taken three at a time there are 20 amino acids.
The answer is alveoli, there the only structures.
Hope this helps! Have a BLESSED day! :-)
Human sleep in bed laying down and sheep stand up and sleep and sometimes lay down. Humans takes big sleep and a sheep just take short naps. When suffer from insomnia, they count people and we count sheep XD.
