*Question*
Amphibians have sense organs to smell and taste chemicals, and smell and taste belong to our chemical sensing system. Given these facts, amphibians have what sort of sensing system among the following options: - strong - retina - four limbs - chemical - mechanical - the eyes - nerves - heat or cold
**Answer**
chemical

*Question*
Sedimentary rocks are formed by deposition, and soils are sand, clay, and organic deposits. Given these facts, what are formed by soil, sand, clay and organic materials among the following options: - sedimentary rocks - loose soil - silts - swamp vegetation - dams - fossil fuels - coral reef - waterways
**Answer**
sedimentary rocks

*Question*
Nuclear reactions in stars causes stars to produce light, and light contains energy. Given these facts, what do nuclear reactions in stars cause among the following options: - heat energy - Change colors - production of energy - hydrogen and oxygen - only black holes - destruction of energy - creation of life - harmful substances
**Answer**
production of energy

*Question*
Blowing air into a whistle causes air to vibrate inside the whistle, and sounds are caused by vibrations in the air. Given these facts, what does blowing into a whistle do among the following options: - makes a sight - makes sound - causes disruption - duplicate itself - unidirectional - decrease stamina - makes hearing - to move people
**Answer**
makes sound