Answer:
The Earth's climate has always changed
Explanation:
Over the course of the Earth's 4.5-billion-year history, the climate has changed a lot. This is true. But the rapid warming we're seeing now can't be explained by natural cycles of warming and cooling.
The codons have length of 3. tRNA can recognize the sequence of mRNA as 3 of a unit. The sequence of the AUCG represents which amino acid is. For example, the sequence of UUU means Phe.
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Polar bonds happen when two atoms form a molecule using a covalent bond.