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### Question 10
# Brief Explanations:
The text states that when homeostasis is disrupted (as in heartburn), the movement of acid into the esophagus interferes with the body’s ability to maintain a stable internal environment.
# Answer:
When homeostasis is disrupted, the movement of acid into the esophagus interferes with the body’s ability to maintain a stable internal environment.

### Question 11
# Brief Explanations:
From the text, two characteristics of life affected by heartburn are: 1) It interferes with normal digestion (energy use); 2) It triggers responses such as pain and inflammation (response to stimuli) (or it may affect cell health if the tissue becomes damaged - cell organization and growth, any two from these three can be chosen).
# Answer:
1. It interferes with normal digestion (energy use).
2. It triggers responses such as pain and inflammation (response to stimuli). (or other valid pair from the given characteristics)

### Question 12
# Brief Explanations:
Heartburn involves the digestive system (acid movement in esophagus) and also affects other aspects like triggering pain/inflammation (nervous/immune system response) and cell health (cellular system). So the digestive system’s disruption (acid in esophagus) connects to other systems (nervous for pain, immune for inflammation, cellular for tissue health), showing interconnection.
# Answer:
Heartburn shows body systems are interconnected because the movement of acid into the esophagus (digestive system issue) triggers responses like pain (nervous system) and inflammation (immune system), and can affect cell health (cellular system), demonstrating how one system’s disruption impacts others.

### Question 13
# Brief Explanations:
Humans as living systems have characteristics like maintaining homeostasis, using energy (digestion), responding to stimuli, and cell organization/growth. Heartburn shows disruption of homeostasis, affects digestion (energy use), triggers responses (to stimuli), and can impact cell health, all of which are traits of living systems, so it’s evidence humans are living systems.
# Answer:
Heartburn is evidence humans are living systems because it involves disruption of homeostasis (a trait of living systems), affects digestion (energy use - a life characteristic), triggers responses to stimuli (like pain/inflammation), and can impact cell health (cell organization/growth), all of which are characteristics of living systems.

### Question 14
# Brief Explanations:
The text says studying heartburn helps scientists understand how body systems interact, how the body responds to lost balance, develop treatments, and understand how to protect the body’s internal environment.
# Answer:
Scientists study heartburn to better understand how body systems interact, how the body responds when balance is lost, develop treatments, and understand how to protect the body’s internal environment.

### Question 15
# Brief Explanations:
Internal balance (homeostasis) is important for survival because it allows the body to function properly. Disruptions like heartburn interfere with normal processes (digestion, cell health, response to stimuli), so maintaining internal balance ensures body systems work as needed for survival.
# Answer:
Internal balance (homeostasis) is important for survival because it allows the body to maintain stable internal conditions necessary for normal functions like digestion (energy use), cell health, and appropriate responses to stimuli; disruptions (like heartburn) interfere with these vital processes, so balance is needed for the body to survive.

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