b. climax communities are not possible
c. dominant organisms drive out pioneer species
d. ecosystems never reach a sustainable point
Correct answer: A) Organisms gradually change the environment
Succession occurs when there is a disturbance in the environment, it would be a minor disturbance like a fire or a major disturbance like a volcanic eruption. Based on the disturbance, succession can be divided into two types:
1). Primary Succession: Primary succession is said to happen when a group of the species or a community evolve from a barren land or a land with no life. This land is fresh and does not have any life on it.
Example: Primary succession occurs after a volcanic eruption
2). Secondary Succession: The secondary succession is said to occur when there is a disturbance and it destroys ecosystem but still there is an availability of nutrient, seed, and soil.
Example: Forest Fire
Succession occurs because organisms gradually change the environment. (Option a.)
Succession is the process by which an ecosystem undergoes changes over time due to the influence of living organisms. It occurs because organisms gradually change the environment they inhabit. In ecological succession, there are two main types:
1. Primary Succession: This occurs in areas where no previous ecosystem existed, such as bare rock, volcanic lava, or newly formed sand dunes. Pioneer species, like lichens and mosses, are the first to colonize such areas. Over time, they break down the rock and create soil, making it possible for other plants and organisms to establish themselves. As the environment changes and becomes more hospitable, the community of species gradually changes, leading to a series of distinct stages until a stable climax community is reached.
2. Secondary Succession: This type of succession occurs in areas that have been disturbed or disrupted, but where soil and some remnants of the previous ecosystem remain. For example, after a forest fire or clear-cutting, the area will undergo secondary succession. Pioneer species, often grasses and shrubs, quickly establish themselves and create conditions for other species to colonize the area. As the ecosystem recovers, different stages of plant and animal communities succeed one another, eventually leading to a climax community that is relatively stable.
In both types of succession, organisms play a significant role in changing the environment, creating conditions that allow new species to establish and eventually leading to a more complex and diverse ecosystem.
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mRNA message ________________ mRNA message G G C U U A G C A
DNA code A C A C T C G G C DNA code _____________________
mRNA message ___________________ mRNA message C U G G C U A C A
Answer: The correct answer is-
Choanozoa.
A phylogenetic tree is a representation of evolutionary relationship between different species. It is constructed on the basis of their similarities and differences in their morphological ( physical traits) as well as genetic characteristics.
Two species are said to be most closely related if they share most recent common ancestor. In other words, when two species are descended from a most recent common ancestor, they are said to be most closely related with each other.
In this question, Animals and Choanozoa share most recent common ancestor.
Thus, animals are most closely related to Choanozoa.
Answer:
Abiotic
Explanation:
Answer:
A buckbrush is biotic, beacuse biotic relating to or resulting from living things, especially in their ecological relations.
Explanation:
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The given blank can be filled with performs all the function.
In case of unicellular organisms, which have a single cell, this single cell perform all the function. For a living organism, responding to stimuli, reproduction, obtaining nutrition, excretion and performing all the metabolic process is necessary. If the organism is made up of single cell, that single cell will perform all these functions necessary for life, other wise, it would be dead.