Well if you mean what does the controlled part of a scientific investigation, it is the part of the investigation that will be your control or your base, untouched, original, data and such.
What kind of geography is this
The correct answer is - d. deciduous forest.
The giant panda lives in the deciduous forested parts of China were the climate is temperate, wet, moisty, and most importantly covered in bamboo trees. The bamboo tree is the only food source of the giant pandas, and it is essential for their survival. Unlike the other bears the giant panda is not an omnivore, and in its evolution due to a genetic mutation it lost its taste for meat and became exclusively a bamboo eater. It is on the verge of extinction nowadays and strict measures are needed for this lovely animal to be protected and preserved.
A slow change to the earth's surface would be the formation of mountain ranges over millions of years due to the shifting of tectonic plates under the earth. Also, another slow change could be considered erosion or weathering. Two rapid changes could be landslides and earthquakes.
