Section 1.3 HW – Answer Key

P 20. Fig 1.17 What do you think the mass of the anole will be at 21 days?

2.8 g – this data follows a pattern of increasing 0.1 g after three days, then remaining at that mass for another three days.

p 26 – Explain the differences between the terms15. Observation vs data Observations are recorded information in an organized way, and deals more with the process of observing. Data is the information recoded from observations. Data can be qualitative or quantitative. 16. Control group vs. Experimental group The control group is used for comparisons. The experimental group has exposure to the variable or testable factor.17. Independent variable vs Dependent variable Independent variables can be changed in increments on purpose. It is the tested factor that could result in a changed outcome. The dependent variable is measured to see the effects of the independent variable. It “depends” on the independent.

18. Which describes this statement, “The frog is 4 cm long”? a. Quantitative datab. Inference

c. Control groupd. Qualitative data

Answer: a. quantitative data19. Which is a testable explanation?

a. Dependent variableb. Independent variable

c. Hypothesisd. Observation

Answer: c. hypothesis

20. Answer: Feeding kittiwakes had an impact on the mean body mass. The fed females had a 75.7 g increase in mean body mass over the control group. The fed males

had a 77.8 g increase. The FMR was reduced in both fed females and males from the control. Fed females saw a 1.04 decrease while fed males saw a 0.54 decrease. The data also indicates that control female kittiwakes have the highest overall FMR. Feeding increases body mass, but appears to lower the energy expenditure of the kittiwakes.

23. The graph indicates that 20m has the highest relative fish biomass.24. The Kachemak colony has access to the greatest relative fish biomass at 40 m.

p 27 STP: Standardized test practice

1. Answer: C

2. Answer: C. 90 days5. Contrast a scientific hypothesis and a scientific theory. Answer: both a hypothesis and a theory are explanations. A hypothesis is a tentative and testable explanation for a specific question, whereas a theory is an explanation of a natural phenomenon that has been repeatedly tested and confirmed. A hypothesis is stated before research has been done.6.

Answer: Unexpected results are not

always bad. For instance, sometimes big ideas come from unexpected results of an experiment whether that be new hypotheses, new questions or new solutions for other problems.