a. new source of fresh water <span>
Other choices are:
</span>
<span><span>b. less access to medicine </span>
<span>c. a higher birthrate </span>
d. a higher fertility rate
New source of fresh water </span>would most likely increase the carrying capacity for humans in a certain region. Water plays many important roles in the ecological and environmental systems, and also in humans. In cellular activities and organismic activities, water is used primarily.
For example,
Water is produce when glucose and fructose undergo a condensation process. The water is removed by the combination of hydrogen and a hydroxyl together. Glucose and Fructose forms a substance called glycosidic linkage. And hydrogen and hydroxyl is separated from glucose and fructose. When Hydrogen and hydroxyl is combined, they create H2o or water.<span> </span>
The process responsible for the movement of substance A into the cell will be active transport.
<h3>What is active transport?</h3>
It is a kind of cellular transportation of molecules against their concentration gradients through the use of energy.
Active transports are different from passive transports. The latter has to do with the cellular transportation of molecules in and out of the cell without involving the use of energy.
In the diagram, there is more concentration of substance A inside the cell than the outside. Thus, moving substance A into the cell will be a movement against its concentration gradient.
The movement of substances against concentration gradients always requires energy, usually in the form of ATP - active transport.
More on active transport can be found here: brainly.com/question/12133248
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B is your answer to your question
The larger the mass, the greater the gravitational pull. bigger planets have a greater gravitational pull so smaller planets get pulled in and start to orbit them.