If engines transform chemical energy into mechanical energy and have a range where they are efficient, then the efficiency of an engine range is due to what? Answer choices: - 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

If chloroplasts are found in plant cells, then where are chloroplasts found? Answer choices: - alveoli - flowers - ovaries - plants - Oak - fruit - grass - animals
plants

Q: If water and time can eventually create a canyon, then water and time can work together to create what? Answer choices: - a wave - canyon - matter - heat - soils - mercury - iron - desert
A: canyon

Question: If microscopes can make things appear larger, then what can make things appear larger? Answer choices: - mutations - deuterostomes - prism - mirror - microscope - glass - goggles - adding heat
Answer: microscope

*Question*
If birds bodies are covered to help them fly and provide insulation, then what is one reason birds have covered bodies? Answer choices: - 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)
If hormones control many cell activities and are very important to the central theme of physiology, then what is hormones controlling cell activities important to? Answer choices: - 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