In 2023, a sudden outbreak of a rare fungal infection spread rapidly through several regions, causing widespread concern among health officials and the public. Despite the alarming situation, Dr. Thompson's team remained ______, working tirelessly to develop effective treatments and containment strategies to curb the spread of the infection.

Which choice completes the text with the most logical and precise word or phrase?

Cell division is a fundamental process in biology, essential for growth, development, and repair in multicellular organisms. Mitosis, a type of cell division, ensures that each daughter cell receives an identical set of chromosomes. This highly regulated and orderly process stands in contrast to other cellular activities that might be more ______. While mitosis follows a precise sequence of phases, ensuring genetic consistency, other processes within the cell can exhibit varying degrees of organization and control.

Which choice completes the text with the most logical and precise word or phrase?

 B.F. Skinner, a renowned psychologist, conducted a series of experiments that have had a profound impact on the field of behaviorism. His work with operant conditioning, where behavior is modified by reinforcement or punishment, is considered _______. Skinner's experiments with pigeons and rats demonstrated the power of reinforcement in shaping behavior, and his findings continue to influence psychological practices and theories to this day.

Which choice completes the text with the most logical and precise word or phrase?

Temperature regulation is a critical aspect of survival for many species. In extreme environments, such as the Arctic, maintaining a stable internal temperature becomes a significant challenge. According to climate scientist Dr. Emily Thompson, the adaptations seen in Arctic animals are a testament to evolutionary ingenuity. These adaptations not only ensure survival but also provide valuable insights into the mechanisms of temperature regulation. While these adaptations are fascinating, researchers often face severe difficulties when conducting fieldwork in such harsh conditions. The extreme cold can affect both the equipment and the researchers themselves, making data collection a formidable task.

Which choice best describes the function of the underlined portion?

The following text is adapted from a scientific article on dark matter. Dark matter is an elusive substance that does not emit, absorb, or reflect light, making it invisible and detectable only through its gravitational effects. Scientists have proposed various theories and conducted numerous experiments to understand its properties and distribution in the universe.

Which choice best states the main idea of the text?