The distal end of the humerus has a pulley-shaped medial articulating surface called the

the backbone of the dna and rna compound is sugar phosphate.

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.