Penn Foster - Biology Lesson 1, The
Nature of Science, the Chemistry of Life,
and Ecology, Exercise Answer Key Exam
Q&A 100% Solved
Lesson 1 - Exercise: Science in Society - Section 1 - Exercise 1 of 3
1. Science is the systematic exploration of _______ about everything in the
physical univer...
1. _______ observation is made using one or more of the five senses. -
✔✔Qualitative
2. An independent variable is a variable that's _______ changed in an
experiment. - ✔✔intentionally
3. An explanation based on an observation is a/an _______. - ✔✔inference
4. There may be only one _______ variable in an experiment. -
✔✔independent
5. _______ observation is made using tools or measurement. -
✔✔Quantitative
6. What's the difference between an observation and inference? - ✔✔An
observation is made using tools or one of the five senses. An inference is a
logical explanation to make sense of observations.
(DO NOT COPY WORD FOR WORD)
7. Independent variable - ✔✔b. The brand of popcorn
, 8. Controlled variable - ✔✔c. The time the popcorn is cooked
9. Responding variable - ✔✔a. The number of unpopped popcorn kernels
Lesson 1 - Exercise: Heart Rate Lab
Part A: Identifying Variables - ✔✔Section 1 - Exercise 3 of 3
1. If the number of cigarettes smoked increases, then the risk for lung
cancer increases.
Independent variable: _______
Dependent variable: _______ - ✔✔Independent variable: number of
cigarettes smoked
Dependent variable: risk for lung cancer
2. If the number of sharks swimming in a coastal region increases, then the
number of shark attacks on humans will also increase.
Independent variable: _______
Dependent variable: _______ - ✔✔Independent variable: number of sharks
swimming in a coastal region
Dependent variable: number of shark attacks on humans
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