The Polar Caps on Mars Are Now Known to Consist

question 391

Multiple Choice

The polar caps on Mars are now known to consist of:

• A) methane (CH₄), ammonia (NH₃), and water (H₂O) ices, whose relative abundances vary with the seasons.
• B) carbon dioxide (CO₂) ice, which evaporates easily, overlaying thicker and more long-lived water (H₂O) ice.
• C) only carbon dioxide (CO₂) ice, which is very volatile and melts easily.
• D) only water (H₂O) ice, which does not melt easily and survives the summer heat.

---

Definitions:

Indonesia

A Southeast Asian country consisting of more than seventeen thousand islands, including Sumatra, Java, and parts of Borneo and New Guinea, known for its diverse cultures, languages, and landscapes.

Genus Homo

The biological genus that includes modern humans (Homo sapiens) and several other extinct human species, characterized by bipedalism, large brains, and tool use.

Habilis

Homo habilis, an early human species known for its use of stone tools, which lived approximately 2.1 to 1.5 million years ago.

Anthropoids

A subgroup of primates, including monkeys, apes, and humans, characterized by their higher brain-to-body size ratio and more advanced cognitive abilities compared to other primates.