Part a: which statement best expresses the central idea of the text? a. having a college degree isn't valuable right now, as there are few jobs that actually require people to have a degree. b. it's difficult to measure the long-term financial payoffs that certain majors will yield, which is why it's best to choose majors based on your interests and strengths. c. students should focus on occupation-specific majors, as they're more likely to be placed into jobs immediately after graduating. d. while liberal art degrees don't prepare students for a specific job, they give widely applicable skills that all employers value.

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: