Which is an example of a building block that form dna?

Calculate the mass of silver needed to react with chlorine to produce 126g if silver chloride?

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)