I would have to go with A
Answer:
Igneous rocks are formed from cooled magma, magma is formed from melted metamorphic rock, metamorphic rock is formed from either heated igneous rock or heated and pressurized sedimentary rock, sedimentary rock is formed from sediments throught compaction and cemenetaion and sediments are formed from weathered and eroded igneous or metarmorphic rocks
Explanation:
For more info look up rock cycles and hit images for a simple format
The answer is B., Natural Selection.
Weather certainly doesn't change populations, and genes only caused individuals in a population to be slightly ( genetically-wise ) different from the others. It does cause change, but not change in the whole population over time.
Natural disasters don't change the populations over time either. Natural disasters only caused change in their environment, at most.
So, the only answer left is natural selection, and it makes sense too!
Natural selection is the process where the individuals with better traits suited to survive in that specific environment live on and give those good traits to their offspring.
The individuals with less suited traits to survive will die out, and will not be given an opportunity to reproduce and pass on their less suited traits, so over time, the population will increase of individuals with better suited traits to survive and the individuals with less suited traits will eventually die out, therefore making the entire population change.
Hope I helped you!
Answer:
I think it's b because the earth's magnetic field had drastically changed shape and direction in the shape