Fact 1: An automobile engine transforms chemical energy into mechanical energy. Fact 2: Automobile engines have a range where they are most efficient. Given the two facts above, answer the question "The efficiency of an engine range is due to what?" with the following options: - Movement of an air mass - principals of aerodynamics - transportation technology - heat production - heat is produced - A transportation fuel - Inches or fractions of inches. - chemical to mechanical energy
chemical to mechanical energy

Fact 1: Chloroplasts are organelles that are found in the cells of plants and algae. Fact 2: Chloroplasts and mitochondria are both organelles. Given the two facts above, answer the question "Where are chloroplasts found?" with the following options: - alveoli - flowers - ovaries - plants - Oak - fruit - grass - animals
plants

Q: Fact 1: Most canyons are formed by flowing rivers through erosion over long periods of time. Fact 2: Erosion is the work of wind, water, and time. Given the two facts above, answer the question "Water and time can work together to create what?" with the following options: - a wave - canyon - matter - heat - soils - mercury - iron - desert
A: canyon

Question: Fact 1: An electron microscope is used for seeing very small objects by making them appear bigger. Fact 2: An electron microscope can see many times larger than an optical microscope. Given the two facts above, answer the question "what can make things appear larger?" with the following options: - mutations - deuterostomes - prism - mirror - microscope - glass - goggles - adding heat
Answer: microscope

*Question*
Fact 1: Feathers help birds fly and provide insulation. Fact 2: Birds have bodies covered with feathers. Given the two facts above, answer the question "What is one reason birds have covered bodies?" with the following options: - To help them burrow - They have thick fur - layers of fat - To help them fly - To keep their body heat. - To attract predators - with their fur - To make them heavier
**Answer**
To help them fly

(Question)
Fact 1: Hormones control many cell activities, so they are very important for homeostasis. Fact 2: Homeostasis is the central theme of physiology. Given the two facts above, answer the question "what is hormones controlling cell activities important to?" with the following options: - gravity - it helps plants in growing - the sun - central theme of physiology - female sex cells - density - Generating heat - production of energy
(Answer)
central theme of physiology