Why do bases have to be read in groups of 3?

Plz plz plz quick! 49 points for whoever which of the following statements about greenhouse effect is true? *life on earth is suffering because of greenhouse effect *the greenhouse effect is caused by human activity *all greenhouse gases are harmful *life on earth would not exist without the greenhouse effect

What is the answer for the complicated molecules that make up living things usually contain carbon. why is carbon so important in these molecules?

What is the relation ship between structure and function in an organism