15. why is recycling important for the environment?\n16. list the three main steps of the water…
15. why is recycling important for the environment?\n16. list the three main steps of the water cycle.\nsection 4: scientific method & skills\n17. put these steps of the scientific method in the correct order: (a) analyze data, (b) ask a question, (c) draw a conclusion, (d) form a hypothesis, (e) test with an experiment.\n18. why is it important to include a control group in an experiment?\n19. in an experiment testing how sunlight affects plant growth, what is the independent variable?\n20. convert the following: 100 cm = ______ m\nsection 5: human body systems\n21. name one system of the human body and explain its main function.\n22. which body system includes the heart?\n23. name one organ in the digestive system.
Answer
15.
Brief Explanations:
Recycling reduces waste in landfills, conserves natural resources, and decreases energy - use and pollution associated with making new products from raw materials.
Answer:
Recycling reduces waste, conserves resources, and decreases pollution and energy - use.
16.
Brief Explanations:
The water cycle involves evaporation (water turning to vapor from bodies of water), condensation (vapor forming clouds), and precipitation (water falling as rain, snow, etc.).
Answer:
Evaporation, condensation, precipitation.
17.
Brief Explanations:
The scientific method starts with asking a question, then forming a hypothesis, testing with an experiment, analyzing data, and finally drawing a conclusion.
Answer:
(b) Ask a question, (d) Form a hypothesis, (e) Test with an experiment, (a) Analyze data, (c) Draw a conclusion.
18.
Brief Explanations:
A control group in an experiment provides a baseline to compare the results of the experimental group, helping to determine if the independent variable is causing the observed changes.
Answer:
It provides a baseline for comparison to determine the effect of the independent variable.
19.
Brief Explanations:
In an experiment, the independent variable is the factor that is deliberately changed. In the case of testing sunlight's effect on plant growth, sunlight is the independent variable.
Answer:
Sunlight.
20.
Explanation:
Step1: Recall the conversion factor
1 m = 100 cm.
Step2: Perform the conversion
$100\ cm=\frac{100}{100}\ m$
Answer:
1
21.
Brief Explanations:
For example, the circulatory system's main function is to transport oxygen, nutrients, hormones, and waste products throughout the body.
Answer:
Circulatory system; its main function is to transport substances throughout the body.
22.
Brief Explanations:
The heart is a key organ in the circulatory system which pumps blood throughout the body.
Answer:
Circulatory system.
23.
Brief Explanations:
The stomach is an organ in the digestive system that breaks down food through chemical and mechanical means.
Answer:
Stomach.