Which process can transport substances against the concentration gradient?

The answer to your question is: Active transportation

Explanation:

Cell can move molecules in or out of it by two processes: Active or Passive transport.

Active transport:  is the movement of molecules against a concentration gradient. Use proteins or enzymes to happen.

Passive transport: is the movement of molecules or ions from a higher concentration to a lower concentration.

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answer: collecting information/data

reason: the student is going around and asking people questions to collect data

i hope this

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.