- Continental drift
- Glacial cycles
Select the correct answer using the code given below:
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
Answer: (c)
Physical factors upon which evolution depends are Temperature, light, water, presence of barriers, salinity, soil characteristics and oxygen availability.
O Continental drift is the gradual movement of the continents across the earth’s surface through geological time. As continents broke apart from Pangaea, species got separated by seas and oceans and speciation occurred. Individuals that were once able to interbreed were reproductively isolated from one another and eventually acquired adaptations that made them incompatible
O This drives evolution by creating new species. Also, as the continents drift, they move into new climates. What was once at the equator may now be near the poles. If species did not adapt to these changes in the weather and temperature, then they would not survive and go extinct. New species would take their place and learn to survive in the new areas. (Option 1 is correct)
O Glacial cycles affect the temperature range dramatically leading to variability in adaptations and natural selection takes the lead. Therefore, evolution is influenced. (Option 2 is correct)
