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Ch. 1 - Evolution, the Themes of Biology, and Scientific Inquiry
Campbell - Campbell Biology 12th Edition
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Tutti i libri di testoUrry 12th EditionCh. 1 - Evolution, the Themes of Biology, and Scientific InquiryProblema 5
Capitolo 1, Problema 5

Which of the following statements best distinguishes hypotheses from theories in science?
a. Theories are hypotheses that have been proved.
b. Hypotheses are guesses; theories are correct answers.
c. Hypotheses usually are relatively narrow in scope; theories have broad explanatory power.
d. Theories are proved true; hypotheses are often contradicted by experimental results.

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1
Understand the definitions: A hypothesis is a proposed explanation for a phenomenon, typically based on limited evidence as a starting point for further investigation. A theory, on the other hand, is a well-substantiated explanation acquired through the scientific method and repeatedly tested and confirmed through observation and experimentation.
Consider the scope: Hypotheses are usually specific and narrow in scope, focusing on a particular aspect or question. Theories, however, are broader and provide a comprehensive explanation that can encompass multiple hypotheses and observations.
Evaluate the process of validation: Hypotheses are tested through experiments and observations. If the results consistently support the hypothesis, it may contribute to the development of a theory. Theories are not 'proved' in the absolute sense but are supported by a significant body of evidence.
Reflect on the nature of scientific inquiry: Science is iterative and self-correcting. Hypotheses can be contradicted by experimental results, leading to refinement or rejection. Theories, while robust, are still open to revision if new evidence emerges.
Choose the statement that aligns with these concepts: Based on the understanding of hypotheses and theories, select the statement that accurately reflects their relationship and characteristics in scientific practice.

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Hypothesis

A hypothesis is a tentative explanation or prediction that can be tested through experimentation and observation. It is usually narrow in scope, focusing on a specific aspect of a phenomenon, and serves as a starting point for scientific investigation. Hypotheses are formulated based on existing knowledge and are subject to validation or refutation through empirical evidence.
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Theory

A theory is a well-substantiated explanation of some aspect of the natural world that is based on a body of evidence and has withstood repeated testing and validation. Theories have broad explanatory power, integrating and generalizing findings from multiple studies to provide a comprehensive understanding of complex phenomena. Unlike hypotheses, theories are widely accepted within the scientific community due to their robust support.
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Scientific Method

The scientific method is a systematic approach to inquiry that involves formulating hypotheses, conducting experiments, collecting data, and analyzing results to draw conclusions. It is essential for distinguishing between hypotheses and theories, as it provides a structured framework for testing ideas and building knowledge. Through iterative cycles of testing and refinement, the scientific method helps transform hypotheses into theories when sufficient evidence accumulates.
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Draw a biological hierarchy similar to the one in Figure 1.3 but using a coral reef as the ecosystem, a fish as the organism, its stomach as the organ, and DNA as the molecule. Include all levels in the hierarchy.

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Which of the following best demonstrates the unity among all organisms?

a. Emergent properties

b. Descent with modification

c. The structure and function of DNA

d. Natural selection

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Which of the following is an example of qualitative data?

a. The fish swam in a zigzag motion.

b. The contents of the stomach are mixed every 20 seconds.

c. The temperature decreased from 20°C to 15°C.

d. The six pairs of robins hatched an average of three chicks each.

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A controlled experiment is one that

a. Proceeds slowly enough that a scientist can make careful records of the results.

b. Tests experimental and control groups in parallel.

c. Is repeated many times to make sure the results are accurate.

d. Keeps all variables constant.

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Systems biology is mainly an attempt to

a. Analyze genomes from different species.

b. Simplify complex problems by reducing the system into smaller, less complex units.

c. Understand the behavior of entire biological systems by studying interactions among their component parts.

d. Build high-throughput machines for the rapid acquisition of biological data.

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Which sentence best describes the logic of scientific inquiry?

a. If I generate a testable hypothesis, tests and observations will support it.

b. If my prediction is correct, it will lead to a testable hypothesis.

c. If my observations are accurate, they will support my hypothesis.

d. If my hypothesis is correct, I can expect certain test results.

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