Which letter correctly identifies the 5 levels of organization from simplest to the most complex? A) person, muscle cell, heart, circulatory system, cardiac muscle tissue
B) muscle cell, heart, cardiac muscle tissue, circulatory system, person
C) muscle cell, cardiac muscle tissue, heart, circulatory system, person
D) person, circulatory system, heart, cardiac muscle tissue, muscle cell

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]

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.

answer; synapse;