Explanation:

Both statements are correct.

Researchers found that marine heat waves (MHWs) deep in oceans may be “significantly under-reported” and caused by ocean currents. 

• A marine heat wave is an extreme weather event. 

• It occurs when the surface temperature of a particular region of the sea rises to 3 or 4 degree Celsius above the average temperature for at least five days. 

• MHWs can last for weeks, months or even years, according to the US government’s agency National Oceanic and Atmospheric Administration (NOAA).

Impacts

• MHWs are prolonged temperature events that can cause severe damage to marine habitats, such as impacts to coral reefs and species displacement.

• These events are becoming more frequent due to global warming, with notable occurrences off Australia's East Coast and Tasmania, as well as the northeast Pacific coast and North Atlantic.

• Higher ocean temperatures, which are associated with MHWs, can make storms like hurricanes and tropical cyclones stronger. 

• MHWs also fuel the growth of invasive alien species, which can be destructive to marine food webs. 

Hence option 3rd is correct.