Here are the answers to each question based on the provided options:
**Question 1:** Which cells carry nutrients from food to the rest of the cells in the body?
**Answer:** blood cells
**Question 2:** How are blood cells and stomach cells similar?
**Answer:** Both help with digestion.
**Question 3:** Which option shows the correct order of organization within multicellular organisms (from least complex to most complex)?
**Answer:** cell → tissue → organ → organ system → organism
**Question 4:** Which statement is true?
**Answer:** Bones provide shape to the body.
**Question 5:** What is systemic circulation?
**Answer:** the path of blood as it moves from the heart throughout the body and back to the heart
**Question 6:** Which organ in the excretory system helps get filter waste?
**Answer:** kidney
**Question 7:** In which two organs is food broken down?
**Answer:** esophagus and stomach
**Question 8:** Which component of nerve cells contains the nucleus?
**Answer:** cell body
**Question 9:** A girl has her eyes shut and is standing inside a brightly lit room. What happens to her pupils when she opens her eyes? Why?
**Answer:** Her pupils shrink because the muscles contract.
**Question 10:** The human body has four types of tissues. What part of the eye uses muscle tissue for opening and closing movements?
**Answer:** Iris
**Question 11:** How do polar bears maintain homeostasis in freezing cold weather?
**Answer:** Their thick fur retains heat.
**Question 12:** Which example shows an organism that cannot reach homeostasis through internal changes?
**Answer:** A lizard is cold, and it moves to a sunny rock to warm up.
**Question 13:** How is homeostasis achieved?
**Answer:** Cells maintain internal stability.
**Question 14:** How are muscle cells and bone cells similar?
**Answer:** Both gather information from inside and outside the body.
**Question 15:** What is the function of an organ system?
**Answer:** to work together to do a specific job
**Question 16:** Which is most complex?
**Answer:** organ system
**Question 17:** Which organ of the respiratory system is located inside the lungs?
**Answer:** bronchioles
**Question 18:** Which organ in the excretory system filters blood?
**Answer:** kidney
**Question 19:** What is the term for changes in the internal or external environment that cause a response?
**Answer:** stimuli
**Question 20:** How do signals from sensory neurons reach motor neurons?
**Answer:** Through interneurons in the brain and spinal cord that connect sensory neurons and motor neurons.
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