Choose the type of paragraph below. Biologists recognize five levels of cell organization. The lowest and simplest is the cellular level. Organisms here are
either unicellular organisms, like protozoa, or colonial organisms. Colonial organisms are composed of single-celled
individuals that stay together to sustain the life of the whole colony. Next on the scale of complexity is the level
occupied by tissue. A tissue is a group of similar cells which perform a similar activity. Tissues that are organized around
a common function together make up an organ, the third level of complexity. The fourth level of organization is the
system, formed by a group of organs which together perform a specific bodily process. The fifth and highest level is the
organism level, in which body systems work together in a structure capable of independent life.
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