What limits what scientists can study in their work? They can investigate only questions that they were the first to ask. They can study only the events that take place on Earth. They can study only phenomena that they can observe. Or they can investigate only the areas of science in which they are experts.

In the air and in the lower fre ah water

The main role of dna in the  cell is the long-term storage of information. it is often compared to a blueprint, since it contains the instructions to construct other components of the  cell, such as  proteins  and rna molecules.the main function of rna is to carry information of amino acid sequence from the genes to where  proteins  are assembled on  ribosomes  in the  cytoplasm. mark brainliest, my work is good.