Answer:
Science is an attempt to explain natural phenomena. People from all cultures contribute to science. Scientific knowledge, while durable, has a tentative character. Scientific knowledge relies heavily, but not entirely, on observation, experimental evidence, rational arguments and scepticism.
Explanation:
A single point mutation<span> can change the whole DNA sequence. Changing one purine or pyrimidine may change the amino acid that the nucleotides code for.</span>Point mutations<span> may arise from spontaneous </span>mutations<span> that </span>occur<span> during DNA replication.</span>
