Does the following sentence support the main idea? sometimes, humpback whales even catch a ride on the ocean currents as they travel down the wet superhighway.

No

The main idea of this paragraph is that humpback whales swim using their tails to move themselves through the water.

Explanation:

The powerful swimmers use their massive tails to move themselves through the water. They travel at an average of six miles per hour, steering with their 15-foot-long flippers. Sometimes, humpback whales even catch a ride on the ocean currents as they travel down the wet superhighway. This makes their three-month trip a little easier.

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.