fibrous substance consisting of polysaccharides and forming the major constituent in the exoskeleton of arthropods and the cell walls of fungi.
PLATO SAMPLE ANSWER:
The desert is hot and dry, while the tundra is cold and frozen. In a desert climate, anatomical structures and behaviors that protect an organism from heat are useful adaptations. Most organisms have adaptations that help them conserve water, because water can be scarce in desert climates. For example, many organisms in the desert are nocturnal, which means they’re most active at night when temperatures are cooler.
Some animals in the desert don't need to drink water, yet things in the tundra need water