Hubble's constant is about 22 km/s/million light-years, implying an age of about 14 billion years for the universe. If Hubble's constant were 11 km/s/million light-years, the age of the universe would be about
A) 7 billion years.
B) 14 billion years.
C) 28 billion years.
D) Impossible to say, because Hubble's constant has no relationship to the age of the universe.
Question 2
Which of the following best describes the predominant scientific view of the origin of life on Earth?
A) Life probably migrated to Earth from some other world.
B) We may never know precisely how life arose, but current evidence suggests that life probably can arise naturally under the conditions that prevailed on the early Earth.
C) Life arose through a series of extremely unlikely chemical coincidences, making it seem almost miraculous that life ever came to exist at all.
D) We can describe with great certainty the precise steps by which life arose on Earth.
Which wavelengths of light are most effective at photosynthesis?
The basalt below the hominins is dated to 1.8 million years ago, and the geomagnetic polarity of the
A levallois core from Kapedo Tuffs, Kenya dates about 130,000 years ago.
Energetics of the two-photosystem light reactions
Speed of Light in Different Mediums
Beak size in finches during dry years increases because of strong selection