Explanations:The question asks for an animal that spends 18-20 hours in sleep and is also known as a possum. The correct answer is the opossum (Option B).
Opossums are marsupials, which means they are mammals that carry their young in a pouch. They are native to the Americas and are known for their extensive sleep patterns. Opossums can sleep up to 18-20 hours a day, which is a significant portion of their daily routine. This sleep behavior is an adaptation to their nocturnal lifestyle and helps them conserve energy.
The term "possum" is often used interchangeably with "opossum" in some regions, particularly in North America. This common name can sometimes lead to confusion with other animals that are also colloquially called possums, such as the Australian brushtail possum. However, the opossum is the animal that fits the description given in the question.
It is important to distinguish opossums from other animals that might be confused with them. For example, koalas (Option A) are marsupials native to Australia and are known for their tree-dwelling habits and diet of eucalyptus leaves. While koalas do sleep a lot, they are not commonly referred to as possums. Sloths (Option C) are arboreal mammals native to Central and South America and are known for their slow movements and long sleep durations, but they are not referred to as possums. Lemurs (Option D) are primates native to Madagascar and are not related to possums in any way.
Understanding the specific characteristics and common names of different animals is crucial for correctly identifying them based on given descriptions. In this case, the opossum's sleep habits and common name make it the correct answer to the question.