In a sceintific experiment what changes in response to another change

What are the answers for the following questions?

Which statement about factories in the industrial revolution is not true? a) some of the first advances were in textile mills b) spinning machines used water power c) water power was replaced by steam power d) coal was imported to english factories for power answer d) coal was imported to english factories for power

Identify the youngest layer in the figure ( have to click one letter)