Why is rna necessary to act as a messenger? why cant the code be taken directly from the dna

Which of the following conclusions can be drawn

Which type of neuroglia is found outside of the brain?

An organ system consists of a group of organs that performs specific functions necessary for the survival of an organism. humans have eleven different organ systems: integumentary, skeletal, muscular, nervous, endocrine, circulatory, lymphatic, respiratory, digestive, urinary, and reproductive. discuss the function of neurons, the brain and the spinal cord within the human nervous system while explaining the interrelationship of each organ.