Answer: Platelets release a vasoconstricting substance called <u>SEROTONIN.</u>
Answer: False
Explanation:
During Primary Succession, an area that has just been newly exposed or is rock that has just formed newly, gets colonized for the first time by organisms.
This is not driven by competition for resources because only certain organisms can even survive in the area in the first place such as lichens or plants which then convert the area to a more habitable form for other organisms over a period of centuries.
This is called 'controlled' or 'prescribed' burning. Usually fires in the environment are regarded as undesirable and dangerous, but fires actually fulfil an important ecological role, and animals and plants had adapted to a certain frequency and intensity of fires. The seeds of some trees or grasses germinate after forest or grass fires, as the more open conditions after a fire allows the seedlings to compete and avoid being shaded and smothered by more established trees. Unfortunately, farming and forestry practices have in many cases resulted in a reduction of fires. A reduction in the frequency of fires also allows the build up of dead wood, and when a wild fire does occur, the amount of available fuel results in very hot, large and damaging fires. Therefore, management of forests and other environments such as prairies often use controlled burns to avoid the buildup of dead organic mass and to replicate the natural fire cycle.
This is called the prophase which is the second stage of mitosis.
