How does this paragraph contribute to the development of ideas in the passage

What word or phrase is modified by the prepositional phrase in the sentence below? marisol's puppy likes napping under the couch because it is warm and cozy

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. main idea:

There are six red marbles 4 blue marbles and 15 green marbles in a jar if you reach in and randomly draw one what is the probability that it will choose a red marble