The case of Mars tells us that which of the following is a critical factor in determining surface habitability?
A) planetary size
B) levels of geological activity
C) distance from the Sun
D) the presence of a magnetic field
Question 2
What is the most compelling piece of evidence that suggests that the dinosaurs were made extinct by the impact of an asteroid 65 million years ago?
A) a layer of sediment laid down at that time which is littered with dinosaur fossils
B) dinosaur fossils are found in rock layers older than 65 million years but not younger than 65 million years
C) a layer of sediment laid down at that time which is rich in the element Iridium (Ir), an element common in asteroids but less common on the Earth
D) the crater from this impact can still be seen in the deserts of Arizona
Phylogeny of modern seedless and seed plants showing critical innovations
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IgM only, then IgD and IgM on the surface of a B cell.
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