1. the four elements that must be present for fire to exist include heat, oxygen, fuel, and

a chemical reaction between the three.

true

false

Read the following conclusion for an essay that claims that extreme sports should be more highly regulated because they are too dangerous: whether it is a high level of physical exertion, or extra doses of the "fear factor," it is common for extreme athletes to beat at the door of fate. it is these people who tempt their own mortality, while curious onlookers wait anxiously for the outcome, who must be protected from themselves. which statement provides the most accurate evaluation of the paragraph? a. the closing statement is unsatisfying b. the passage introduces new evidence. c. the thesis is not restated. d. the style is informal and inconsistent.

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:

Read the passage.which statement best describes how pacing of events heightens tension