Asynaptic cleft, or synaptic gap, can be found between a neuron and

other neuron, a gland or a muscle cell.

Explanation:

Synapse refers to the region where the impulse is carried and the communication occurs between two neurons or between a neuron and a target cell. The target cells for motor neurons is a gland or muscle fiber. Therefore, a neuron can synapse with another neuron, with a gland or with a muscle fiber. The gap present at the synapse is called a synaptic cleft or synaptic gap that separates the two synapsed cells. The synapsed cells communication by neurotransmitters released from the presynaptic neuron.

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.