*Question*
Answer the following question given this paragraph: Isotopes have different numbers of neutrons in their nuclei. Q: Isotopes have different number of these in their nuclei? Choices: - protons - electrons - atoms - neutrons A:
**Answer**
neutrons

*Question*
Answer the following question given this paragraph: Polar Bears. Thick fur and a layer of blubber keep polar bears warm in their Arctic ecosystem. Why do you think their fur is white? Why might it be an adaptation in an Arctic biome?. Q: What type of ecosystem do polar bears live in? Choices: - tropical - oceanic - natural - arctic A:
**Answer**
arctic

*Question*
Answer the following question given this paragraph: Q: White light is a mixture of all wavelengths of what? Choices: - gamma radiation - infrared radiation - x-rays - visible light A:
**Answer**
visible light

*Question*
Answer the following question given this paragraph: The location of nephrons in the kidney. The fluid collects in the nephron tubules and moves to the bladder through the ureter. Q: After fluid collects in nephron tubules in the kidney, where does it move to? Choices: - the uterus - the prostate - the spleen - the bladder A:
**Answer**
the bladder