In psychology, the manipulation is described a change done, in order to obtain a certain result, but this does not guaranty that the result would be seen in future.
In this case, the lady (Bethany) switches the diet of the dog. She thinks that switching the food of the dog can help the dog to lose weight. This may or may not be true.
So, this case is an example of manipulation.
Metals and the frequency in which they're found influences a lot since different metals have different densities. Heat also influences a lot since hotter things tend to be less dense though the inner core is more dense.
Answer:
The inner core is more dense because it's liquid and hotter, and since it's liquid the earth's movement makes it difficult for the inner core to be less denser than it is.


Hope it helped,
BioTeacher101
The correct answer to this question is this one: they lacked oxygen. The earliest organisms were completely heterotrophic in nature because of the reason that they lacked oxygen. <span>A heterotroph is an organism that cannot fix carbon and uses organic carbon for growth. </span>