You are presented with the question "_ can change liquid to gas." and the following answer choices:  - magnetism  - cycles  - energy  - vapors  - condensation  - gravity  - thirst  - Heat  Now knowing that heat can change the state of matter and matter exists in a solid, liquid or gas state and can change forms, choose the best answer.
Heat

You are presented with the question "muscle contraction occurs when a diagonally oriented part of muscle gets what?" and the following answer choices:  - shorter  - longer  - vertical  - decreases  - resistance  - muscles  - movement  - forces  Now knowing that muscle contraction occurs when muscle fibers get shorter and fibers are oriented diagonally across fiber, choose the best answer.
shorter

You are presented with the question "Viral envelopes are sometimes made of fats and what?" and the following answer choices:  - cellulose  - glucose  - Energy.  - protein  - viral particles  - Energy  - food  - bacteria  Now knowing that some viruses have an envelope of phospholipids and proteins and phospholipids are body fats, too, choose the best answer.
