In a prokaryotic cell most ribosomes are

Although there are a limited number of amino acids many different types of proteins exist because..

How do you date a sample of rock that you suspect as being one of the earliest on earth

What is the function of the somatic nervous system? connects the brain and the spinal cord to the rest of the body carry signals to the muscles and glands includes all nerves controlling the muscular system and external sensory receptors controls internal organs like the heart and bladder