What is the basic structure of a virus?
a. a bacteriophage surrounded by a membrane
b. dna or rna surrounded by a protein coat
c. a tiny cell surrounded by a cell wall
d. a capsid surrounded by a protein coat

cell division is not regulated in tumor cells.

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.