Question

students in a biology class thought that salt water would affect the movements of worms. they put 25 worms in salt water and recorded their observations. which flaw or problem was present in the design of their experiment?
the sample was too big.
there was no hypothesis.
the procedure was too complicated.
there was no control group.
question 8
1 pts
if you have a basic understanding of scientific facts and theories, and (more importantly) of the process of science as a way of understanding the world and making decisions, you are considered
this question will show a checkbox next to each answer; you must select all the correct answers.
illiterate.
functionally mute
scientifically literate.
credentialed.
theoretically literate.

Explanation:

First Question (Experiment Flaw)

To determine the flaw in the experiment, we analyze each option:

• "The sample was too big" is incorrect; a sample of 25 worms is reasonable for such an experiment.
• "There was no hypothesis" is incorrect because the students’ thought (“salt water would affect the movements of worms”) acts as a hypothesis.
• "The procedure was too complicated" is incorrect; the procedure (placing worms in salt water and observing) is simple.
• "There was no control group" is correct. A control group (e.g., worms in regular water) is needed to compare with the experimental group (worms in salt water) to determine if salt water actually affects worm movement.

We analyze each option based on the definition of scientific literacy:

• "illiterate" refers to inability to read/write, not scientific knowledge. Eliminate.
• "Functionally mute" refers to communication difficulties, not scientific understanding. Eliminate.
• "scientifically literate" matches the definition: understanding scientific facts, theories, and the scientific process. Select.
• "credentialed" refers to having formal qualifications, not scientific understanding. Eliminate.
• "theoretically literate" is not a standard term for scientific understanding. Eliminate.

Answer:

D. There was no control group.

Second Question (Scientific Literacy)