Depending on the type of natural disaster, the ecosystem will be more or less damaged.
Explanation:
After a huracane or tornado the balance or homeostasis of the ecosystem will be very damaged. Biotic (all living organisms) and abiotic (non-living organisms) will be detroyed, killed, relocated and /or lost. Due to this situation, it will take a while for the ecosystem to recover.
Depending on the damage of the natural disaster and the capacity of recovery ( resilence), this ecosystem will take long time or short time in being recuperated. In terms of nature, primary species will arrive first, then secondary, and this "re-poblation" will promote the recuperation of the ecosystem.
A prolonged exposure to extreme cold environment would activate the brain's heat-gain center. Your brain's heat-gain center causes shivering in order to increase our muscle contraction which leads to warming of our body. Increase sweating is the regulatory processes our body use if it experience very high temperature. In order to regulate internal temperature of body, our body remove water which takes up heat with itself to lower th internal temperature.
Lichens is regarded as a mutual relationship between a mycobiont and photobiont, the relationship is targeted at enhancing their survival in extreme environments. The mycobiont is a fungal while the photobiont is usually a green alga or a mycobacterium. Each of the organism has their specific tasks; the mycobiont provides suitable habitat for the photobiont while the photobiont provide energy for the whole system.