2. Chemicals in the water can harm animal life and too much trade.
Answer is the last sentence
In a procedure called random assignment, participants are placed in experimental conditions on the basis of chance, thus minimizing biases or preexisting differences in the groups.
Basically, the experimental condition is once the man of science manipulates the variable to assess its result on the variable. Below the experimental conditions, the participants receive experimental treatment whereas the participants within the control group don't receive any treatment.
Random assignment helps make sure that members of every group within the experiment area unit identical, which implies that the teams are doubtless a lot of representative of what's present within the larger population.
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Microvilli are the tiny projections in the cell lining the villi. It increases the surface area of absorption thereby increasing absorption.
Microvilli on the surface of epithelial cells such as those lining the intestine increase the cell’s surface area and thus facilitate the absorption of ingested food and water molecules. Microvilli are also sometimes called the intestinal brush border.
The combination of circular folds, villi and microvilli helps absorption by increasing the surface area of the small intestine by 30 to 600 times.
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Where the Brush border of small intestine cells is formed ?</h3>
The innermost layer lining the lumen of the alimentary canal is the mucosa. This layer forms irregular folds (rugae) in the stomach and small finger-like folding called villi in the small intestine.
The cells lining the villi produce numerous microscopic projections called microvilli giving a brush border appearance found on the apical surface of some epithelial cells. These modifications increase the surface area enormously and help in secretion and absorption.
Microvilli are covered in the plasma membrane, which encloses cytoplasm and microfilaments. Though these are cellular extensions, there are little or no cellular organelles present in the microvilli. Hence, the brush border of small intestine cells is formed of microvilli.
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The answer is "<span>concrete operational thinking".
The concrete operational stage starts around age seven and proceeds until roughly age eleven. Amid this time, kids pick up a superior comprehension of mental activities. Youngsters start considering solid occasions however experience issues understanding unique or theoretical ideas.
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