Answer is very cold temperatures, lack of trees and low biodiversity
The Tundra is defined mainly by permafrost, lack of trees, low biodiversity, and harsh conditions. It occupies the area between the polar ice caps and the boreal forests (or taiga).
The tundra biome is characterized by extremely cold temperatures and treeless, frozen landscapes. There are two types of tundra, the arctic tundra and the alpine tundra.
The World’s Ice Deserts: The Tundra Biome
The tundra is the coldest of all the biomes with an annual average temperature of less than 5°C, and precipitation (mostly in the form of snow) less than 100 mm per year. The weather conditions at tundra are so harsh that only a handful of plants and animals can even survive there. The word tundra comes from the Finnish word ‘tunturia’ which means treeless plain.
The tundra is one of the least understood and most fascinating biomes on the planet. This incredibly difficult climate and the environment have both a bizarre and diverse range of animals that have learned to survive with the limited amounts of green plant life, sunlight and moisture. Due to extremely cold temperatures, the layer just below the surface remains permanently frozen. This frozen layer of ground is called ‘permafrost.’
An embryonic cell
The reason for this is that embryonic cells need to multiply very quickly and into large numbers so their cell cycles are short.
The zone of proximal development, often abbreviated as ZPD, is the difference between what a learner can do without help, and what they can't do<span>.
</span>For instance, an instructor is instructing students regarding the water cycle. If an instructor has already instructed a lesson on the thought of evaporation, the teacher ought to use this previous information of evaporation once introducing info regarding condensation. The kid can then be ready to build connections between the various <span>phases of the water cycle.</span>
