
Ecological succession is the gradual process by which ecosystems change and develop over time. Nothing remains the same and habitats are constantly changing.
<h3><u>There are two main types of succession, primary and secondary</u><u>:</u><u>-</u></h3>
Primary succession is the series of community changes which occur on an entirely new habitat which has never been colonized before. For example, a newly quarried rock face or sand dunes.
Secondary succession is the series of community changes which take place on a previously colonized, but disturbed or damaged habitat. For example, after felling trees in a woodland, land clearance or a fire.
The Major Points:
The species living in a particular place gradually change over time as does the physical and chemical environment within that area.
Succession takes place because through the processes of living, growing and reproducing, organisms interact with and affect the environment within an area, gradually changing it.
Each species is adapted to thrive and compete best against other species under a very specific set of environmental conditions. If these conditions change, then the existing species will be outcompeted by a different set of species which are better adapted to the new conditions.
The most often quoted examples of succession deal with plant succession. It is worth remembering that as plant communities change, so will the associated micro-organism, fungus and animal species. Succession involves the whole community, not just the plants.
<h2>ꜰᴏʟʟᴏᴡ ᴍᴇ❤</h2>
Although recent studies suggest that posttraumatic stress disorder (PTSD) symptoms and pain may be related, the possible mediational role of depression in this relationship has not been examined. This study sought to examine this question in a sample of 130 male veterans seeking assessment or treatment for deployment-related PTSD. Results suggest that PTSD and pain are moderately related (r<span> = .29) but that this relationship is fully mediated by depression. Our findings have important clinical implications: Treatment of PTSD and pain in veteran populations should include careful assessment and regular monitoring of depression.</span>
Not all of those offspring are likely to live to adulthood, whereas the parent penguin can pay attention to the one chick it has so it is more likely to live to adulthood
The answer to this is multicellular. Unicellular organisms' life processes all take place in the one cell which is their entire being - their entire existence - whereas multicellular organisms require specialized organs and organ systems to keep us alive.
Answer.
B. Multicellular