B. A balanced
Explanation:
In a balanced ecosystem decomposers breakdown dead or decaying organisms and they return nutrients to the soil to be used by plants.
A balanced ecosystem maintains an equilibrium between the biotic component and abiotic component of the system.
- The nutrient cycling between biotic component and abiotic part of the ecosystem is kept going by decomposers.
- Decomposers are organisms that breaks down dead and decaying organisms.
- They release the nutrients trapped in them in the process.
- The nutrient in the soil is in its abiotic state.
- When plants takes up the nutrient, it enters back into the biotic component.
- Decomposers helps to maintain the balance in the ecosystem.
Learn more:
Decomposers brainly.com/question/12823338
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Answer:
The correct option is<em> A. Active transport moves substances against the concentration gradient.</em>
Explanation:
Active transport can be described as a transport mechanism in which molecules tend to move against the concentration gradient i.e from an area of lower concentration to an area of higher concentration. Energy is needed for this process to occur.
Facilitated diffusion can be described as a phenomenon is which molecules move along the concentration gradient i.e from a higher concentration to a lower concentration with the help of trans- membrane integral proteins
Answer:
a. The mtDNA of Anna Anderson bore no resemblance to that of Tsarina Alexandra
c. Tsarina Alexandria's mtDNA was found to be a match to that of the teenage girl.
Explanation:
Mitochondria contain their own DNA known as mtDNA, a strand which is inherited maternally. mtDNA can be used to find maternal ancestry and cannot be passed down by a paternal parent.
This information provides evidence given that the remains of the teenage girl had mtDNA that was identical to the mother, Tsarina Alexandra. It also gave evidence as to why Anna Anderson's claim of being Anastasia were false as the mtDNA of her and Tsarina Alexandra were not similar.
As to why the other answers cannot support the hypothesis, mtDNA is a maternally passed-down strand making the father, Tsar Nicholas Romanov, from having identical mtDNA to his children. On the other hand, if the teenage girl were to not have matching mtDNA to that of Tsuarina's mtDNA, this would disprove the theory of the girl being related to her.
While the teenage boy also had matching mtDNA with the girl, this only proves that the two were related to one another but not necessarily related to Tsarina unless the mtDNA of all three were proven identical.
People in everyday language use theory as a guess and estimation
Scientists use scientific method and do all sorts of experiments to prove their theory
