Poor, rocky soil limits the life forms found in the tundra. in this case, the biosphere is being limited by the

In the given case, the biosphere is limited by the atmospheric temperature.

The tundra soils are produced at high altitudes. It is generally very cold in the tundra, the tundra soils are classified as Gelisols and are usually frozen. In tundra, the top of the mixture of gravel, soil, and finer substances are frozen for the maximum of the year as the temperature do not increase much for the soil to get thaw.

In tundra, the soil is also very much deficient in nutrients, thus, it lacks phosphorus and nitrogen, that is, the two essential elements needed by the plant to grow. This makes the plants small and slow in growth. In this region, the permafrost produces when plants die and the organic matter accumulates. With time, it is compacted and frozen but never gets dissociated.

cramming before a final is bad because it makes a student's stress level higher. students who embrace cramming to get through a final exam week find themselves struggling to perform consistently, once the brain adjusts to prolonged sleep deprivation.

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.