Q: Ejaculation occurs when muscle contractions propel sperm from the epididymes, and ejaculation is the expulsion of semen. Given these facts, the expulsion of semen occurs when what propels sperm from the epididymes among the following options: - birth - muscle contractions - kinetic energy - urine - rapid expansion - air - heat produced - matter vibrating
A: muscle contractions

Q: Fish have a centralized nervous system with a brain, and all fish are creatures that swim. Given these facts, what that can swim have a centralized nervous system with a brain among the following options: - ships - humans - ducks - creatures - animals - water - boats - fur seals
A: creatures

Q: Lung cancer is most often caused by exposure to tobacco smoke, and lung cancer for most is the consequence of smoking. Given these facts, what is lung cancer a consequence of among the following options: - candy cigarettes - harmful substances - Greenhouse gases - malnutrition - water vapors - metabolic reaction - tobacco fumes - Pesticides
A: tobacco fumes

Q: Loud noises can cause animals to startle, and and at 4,000 rpm, highway engine noise is still plenty loud. Given these facts, what can startle animals among the following options: - pigeons - Electrical - Frogs - nothing - sunset - Movement - engines - sunrise
A: engines