How does a fixed pulley act as a machine? It changes the direction of the input force only.
It changes neither the size nor the direction of the input force.
It changes the direction and the size of the input force.
It changes the size of the input force only.

The light is great source of energy

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.