Reef corals weathered dino extinction, may survive global warming

The video discusses how algae harness energy from sunlight and their symbiotic relationship with coral, which was believed to have started 50-65 million years ago but new research suggests it began 160 million years ago. It highlights the genetic diversity of algae, suggesting the genus Symbiodinium should be divided into 15 genera with numerous species. The video also addresses concerns about coral bleaching due to warming waters, noting that some algal species may be more heat-tolerant.

What is the primary benefit that algae provide to coral in their symbiotic relationship?

• Shelter from storms

• Increased water flow

• Protection from predators

• Energy from sunlight

When did the symbiotic relationship between algae and coral likely begin according to recent research?

• 100 million years ago

• 200 million years ago

• 160 million years ago

• 50 to 65 million years ago

What does genetic analysis suggest about the genus Symbiodinium?

• It should be divided into 15 genera

• It is not related to coral

• It should be classified as a single species

• It has no genetic diversity

What environmental concern is associated with coral bleaching?

• Increased salinity

• Ocean acidification

• Warming waters

• Rising sea levels

How do some algal species respond to increased temperatures?

• They stop photosynthesis

• They may tolerate heat better

• They are expelled by coral

• They become more susceptible to bleaching