I believe the answer is: c understanding constancy and change throughout the lifespan.
In social settings, developmental science research is being done by observing the change that the subjects experience if being put at a certain time of environment over time. Example of its research would be finding out whether there is a correlation between parents income with performance throughout school years.
Imperialism is the intention of one country to rule over another country: for example Great Britain wanted to gain control over India - this is an example of imperialism.
For this land is definitely needed : without a land, there is no "other" land to take over.
I would say that the other necessary aspect is people: the ruling country will need some local population to rule the country, if not only to translate and help them communicate with the local population.
Answer:
Your back
Explanation:
Your spinal cord is one of the main hosts of sensory muscles and veins which are highly sensitive.
Also, a good rule of thumb is that your back is often more receptive to high or low-temperature precursors (such as scalding/freezing water) compared to the hand, so keep that in mind.
Hope that helps :)