19. a biologist reported success in breeding a tiger with a lion, producing healthy fertile offspring. other biologists will accept this report as fact only if 1 research shows that other animals can be crossbred 2 the offspring are given a new scientific name 3 the biologist included a control in the experiment 4 they can repeat the experiment and get the same results 20. scientists could consider any testable hypothesis valuable because it might 1 explain the results of their other experiments 2 lead to further research even if not supported by the evidence 3 require no further investigation if not supported by the data 4 explain their conclusion even if it is refuted by the experiment part b—analysis and open ended 21. describe the basic steps of the scientific method in the sequence in which they should be used. 22. define and distinguish between the terms hypothesis and theory. 23. why is the development of a research plan necessary before testing a hypothesis? 24. why is a clear statement of a hypothesis very important to the experiment that will follow? 25. describe three ways in which a scientist can collect and organize data. 26. why is it so difficult for the results of one experiment to become a theory? 27. compounds containing phosphorus that are dumped into the environment can upset local ecosystems because phosphorus acts as a fertilizer. the following graph shows measurements of phosphorus concentrations at two sites taken during the month of june, from 1991 to 1997.

Question

Accepted Answer

### 19.
# Brief Explanations:
In science, for a result to be accepted as fact, it must be reproducible. Repeating the experiment and getting the same results validates the initial finding.
# Answer:
4. they can repeat the experiment and get the same results

### 20.
# Brief Explanations:
A testable hypothesis is valuable because even if it is not supported by evidence, it can lead to further research, helping to expand scientific knowledge.
# Answer:
2. lead to further research even if not supported by the evidence

### 21.
# Brief Explanations:
The scientific method steps are: making an observation, forming a hypothesis, designing and conducting an experiment, analyzing data, and drawing a conclusion.
# Answer:
1. Make an observation.
2. Form a hypothesis.
3. Design and conduct an experiment.
4. Analyze the data.
5. Draw a conclusion.

### 22.
# Brief Explanations:
A hypothesis is a proposed explanation made on the basis of limited evidence as a starting - point for further investigation. A theory is a well - substantiated explanation of some aspect of the natural world, based on a body of facts that have been repeatedly confirmed through observation and experiment.
# Answer:
A hypothesis is a tentative explanation; a theory is a well - established explanation.

### 23.
# Brief Explanations:
A research plan is necessary before testing a hypothesis to ensure the experiment is well - designed, variables are controlled, and the data collected will be relevant and reliable.
# Answer:
To ensure proper experiment design, control of variables, and collection of relevant and reliable data.

### 24.
# Brief Explanations:
A clear statement of a hypothesis is important as it defines the purpose of the experiment, helps in designing the experiment, and provides a basis for interpreting the results.
# Answer:
It defines the experiment's purpose, aids in design, and provides a basis for result interpretation.

### 25.
# Brief Explanations:
Scientists can collect and organize data by making observations, conducting surveys, and performing experiments. They can use tables, graphs, and charts to organize data.
# Answer:
1. Making observations.
2. Conducting surveys.
3. Performing experiments.

### 26.
# Brief Explanations:
For the results of one experiment to become a theory, they need to be repeatedly confirmed by multiple independent experiments and explain a wide range of related phenomena, which is difficult to achieve.
# Answer:
Results need to be repeatedly confirmed by multiple independent experiments and explain a wide range of related phenomena.

### 27. (No question provided for this part in the instruction, so no answer given for this item)

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QUESTION IMAGE

Question

Explanation:

19.

Answer:

20.