What are the three basic characteristics of all cells

All cells have at least three common features: a cell membrane, cytoplasm and DNA. Every cell has a selectively permeable cell membrane that allows some materials to pass in and out of the cell, and contains the water-based solution cytoplasm.

All cells share four common components: a plasma membrane: an outer covering that separates the cell's interior from its surrounding environment. cytoplasm: a jelly-like cytosol within the cell in which other cellular components are found. DNA: the genetic material of the cell

the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.

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.