When hunting by humans causes a species to become extinct, this may produce damaging effects throughout the ecosystem of the extinct species. What is the cause of this damage? OPTIONS:
- alteration of a food web
- degradation of a habitat
- modification of a climate
- reversal of a flow of energy
A: alteration of a food web

Snapping a rubber band most likely produces which type of energy? OPTIONS:
- heat
- light
- sound
- electrical
A: sound

The longitude of a location determines which time zone it is in. Different time zones are the result of OPTIONS:
- Earth's rotation
- Earth's revolution
- the Moon's rotation
- the Moon's revolution
A: Earth's rotation

When specific hormones are present in the blood of a hen, an egg is released from an ovary. Which two systems are involved with the release of an egg? OPTIONS:
- immune and digestive systems
- digestive and endocrine systems
- reproductive and immune systems
- endocrine and reproductive systems
A:
endocrine and reproductive systems