The answer is 4. Hope this helps
Answer:
The genetic code has four main features: Three nucleotides/bases encode an amino acid, there are 20 different amino acids which are the building blocks for proteins. The genetic code is non-overlapping
Explanation:
Water is essential to life because it creates us humans, plants, animals, etc. So, if we find water on Mars it would be important because water is essential to life, meaning we would know that there would be some kind of life on Mars because water makes up anything.