If folding a solid causes it to change shape, then what can you fold to cause it to change shape? Answer choices: - gas - a prism - liquid - biceps - solid - Enzymes - particles - fibers
solid

If starfish lack respiratory and excretory systems, then what lack respiratory and excretory systems? Answer choices: - fish - graptolites - starfish - waste - humans - barnacles - insects - ferns
starfish

Q: If cells secrete acids to break down proteins, then why do cells secrete acids? Answer choices: - Make money - resistance activities - allow growth - Plant growth is reduced - Break down proteins - Hurt things - increases a body's strength - Help friends
A: Break down proteins

Question: If the continents drifting causes earthquakes, then what causes earthquakes? Answer choices: - Electrical energy - The area was once underwater - energy of moving objects - Melting glaciers - Cold air colliding with warm air - Continents drifting - electromagnetic energy - Climate change
Answer: Continents drifting

*Question*
If the vanes rotating in an electric fan cause gases to move, then the vanes rotating in an electric fan cause what to move? Answer choices: - energy - waves - wind - cars - storms - homes - Lift - gases
**Answer**
gases

Q: If smoke is a product of oxygen being burned, then smoke is a product of what being burned? Answer choices: - an object - oxygen - engines - trees - Oak - energy - Cooking - Cars
A: oxygen