Using a gasoline engine requires burning gasoline, and gasoline ignites easily and burns vigorously. Given these facts, using a gasoline engine requires what among the following options: - electricity  - no ignition  - carbon dioxide  - easy ignition  - difficult ignition  - no gasoline  - hydrogen and oxygen  - adding heat
easy ignition

Ejaculation occurs when muscle contractions propel sperm from the epididymes, and male orgasm and ejaculation are inhibited. Given these facts, in the male orgasm, where is sperm propelled from among the following options: - seeds  - pollen  - distance  - organ  - sensory neurons  - direct energy  - epididymes  - electrically
epididymes

Flowing water can slowly dissolve carbon in sedimentary rock, and rivers and streams are bodies of fresh, flowing water. Given these facts, what can slowly dissolve carbon in sedimentary rock among the following options: - hydrocarbons  - acetic acid  - precipitation  - evaporation  - rivers and streams  - puddles  - ponds  - nitrogen

rivers and streams