Answer: Active transport is the movement of ions or molecules across a cell membrane into a region of higher concentration, assisted by enzymes and requiring energy.
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Our living species migrated to the “environment”, established in the area, and then it will increase by number. After that we have competition and co-action resulting in the survival of fit individuals and the elimination of unfit individuals from the ecosystem.
        
             
        
        
        
<u>Answer</u>: B.  Basic needs, such as food and water, will be scarce.
As the population increases, the resources necessary to feed the additional persons will also increase. However, basic resources such as food and water are not unlimited. Some countries have more and some less.
Thus, the amount of available drinking water will decrease as well as the available farmland. Due to more mouths to feed, food insecurity will increase as it is uncertain if it is possible to adequately feed the new population.
 
        
             
        
        
        
The villi of the small intestine use active transport to take up nutrients after concentration has reached equilibrium. 
<h3>What is Active transport?</h3>
Active transport may be defined as the process that occurs against the concentration gradient and is mediated by carrier proteins. Metabolic energy is used to move ions or molecules against a concentration gradient. 
During the process of digestion, the villi in the small intestine enthrall the soluble nutrients gradually. Over time, the concentration of nutrients in the villi acquires an equilibrium with the concentration in the gut. Until here, the nutrient uptake is carried by the process of passive diffusion. 
But after attaining the equilibrium, the nutrient uptake is carried by the process of active transport. 
The complete question is as follows:
What part of the body uses active transport to take up nutrients after concentration has reached equilibrium?
- Lungs
- Stomach
- Small intestine
- Liver
Therefore, the correct option for this question is C, i.e. small intestine. 
To learn more about Active transport, refer to the link:
brainly.com/question/18434867
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Lingual lipase starts the digestion of the lipids/fats. Salivary amylase<span>: Carbohydrate digestion also initiates in the mouth. </span>Amylase<span>, produced by the </span>salivary<span> glands, breaks complex carbohydrates to smaller chains, or even simple sugars. It is sometimes referred to as ptyalin.</span>