CLEAN : Mexican gray whales endangered by rising water temperatures

The video discusses a long-term study that began in the 1970s, focusing on environmental changes and their impact on marine life, particularly small invertebrates sensitive to temperature and salinity changes. It highlights the lifespan and migratory patterns of whales, noting that some whales observed in the 1970s are still present today, returning annually to give birth.

When did the study of whales begin, allowing researchers to observe trends in abundance?

• 2000s

• 1980s

• 1970s

• 1990s

What is the main concern regarding environmental changes affecting whales?

• Increase in ocean currents

• Changes in water temperature, salinity, and acidity

• Decrease in sunlight

• Increase in ocean noise

What do whales primarily feed on that makes them sensitive to environmental changes?

• Small invertebrates

• Plankton

• Large fish

• Seaweed

How long do whales typically live?

• 10-20 years

• 30-40 years

• 50-60 years

• As long as humans

What is a notable behavior of whales observed since the 1970s?

• They have stopped migrating

• They migrate to different oceans every year

• They return to the same place every winter to give birth

• They change their feeding habits annually