Which of the following provide the first clear geophysical evidence for continental drift?
a
Radioactive decay
b Apparent polar wander
C Stratigraphic research
d All of the above

Which of the following statements is true? 1. the mantle of the earth is made of solid nickel and iron. 2. the crust of the earth is made of solid nickel and iron. 3. the inner core is made of solid nickel and iron.

What pattern of migration do whales follow?

Asegment of dna that codes for rna and a protein is a