Hibernation and Estivation Certaln specles of animals hlbernate during cold weather In the winter. Some animals estlvate durlng hot weather In the summer. Both hibernation and estlvatlon are types of dormancy. An anlmal that Is hlbernating or estlvating may appear to be asleep. However, dormancy Is different from sleep. During a time of dormancy, an animal's body processes usually slow down. Its heart rate decreases; It does not need to eat or drin and It uses less oxygen than It does when It Is not dormant. Some animals estivate during long perlods of heat and drought when lIttle water Is avallable. Before golng Into estlivation, an animal wll often finda safe shelter In which to estlvate. North Amerlcan desert tortolses, for example, burrow below the soll before going Into estivatlon. They remaln underground untl the perlod of heat and drought Is over, Other animal specles hlbernate during long perlods of cold. Amerlcan toads, for example, dlg burrows durlng winter when temperatures are low and food Is hard to find. However, not all frogs are capable of digging. The spring peeper frog and the wood frog take shelter In logs or under rocks and spend the winter there. Anlmals emerge from hlbernatlon when the weather warms up. Which conclusion can be drawn from thiss passage? O 1. Animals are more lIkely to hlbernate than to estivate. O2. Animals that estivate In the summer also hlbernate in the winter. 3. Animals go into dormancy to help them survive harsh condltions. O4. Animals take shelter underground during a period of dormancy