*Question*
Fact 1: Spores may be dispersed by moving water, wind, or other organisms.  Fact 2: Ferns reproduce by spores.  Given the two facts above, answer the question "What helps ferns in reproduction?" with the following options:  - cell wall  - Fruits  - wind  - pollen  - sun  - seeds  - nectar  - earthquakes
**Answer**
wind

*Question*
Fact 1: Chemical weathering causes iron in rock to oxidize.  Fact 2: Iron oxide gives a rusty red color to sedimentary rocks.  Given the two facts above, answer the question "What gives a rusty red color to sedimentary rocks?" with the following options:  - food coloring  - The area was once underwater  - chemical weathering  - remains of prehistoric life  - deoxyribonucleic acid  - sea urchins  - dirt  - earthquakes
**Answer**
chemical weathering

*Question*
Fact 1: Irradiating food can be used to kill existing microorganisms in the food.  Fact 2: Fermentation occurs through the action of microorganisms in the large intestine.  Given the two facts above, answer the question "Irradiating food can be used to kill what in the food?" with the following options:  - Something that causes attraction  - one celled organisms  - Something that causes fermentation  - Something that causes digestion  - microscopic building blocks  - single-celled organisms  - Microscopic organisms  - Something that causes evaporation
**Answer**
Something that causes fermentation

*Question*
Fact 1: Birds are endothermic tetrapod vertebrates.  Fact 2: Some birds fly and some birds swim, but all birds have feathers.  Given the two facts above, answer the question "Some aviary species fly and others swim but, all endothermic tetrapod vertebrates share what trait?" with the following options:  - warm-blooded  - Weight  - fur and fat  - sweating  - Epidermis  - feathers  - retina  - four limbs
**Answer**

feathers