An Arizona desert measures 50 square kilometers. A botanist recorded that there are 150 Saguaro cactus plants within the desert boundaries. What is the population density?

Population Density

The population density is 3 per square kilometers

Explanation:

Population density is defined as  population divided by total land area or water volume, as appropriate. An Arizona desert measures 50 square kilometers. A botanist recorded that there are 150 Saguaro cactus plants within the desert boundaries.

So the population density will be 150 divided by 50 which will  be 3 per square kilometers

Hence the population density is 3 per square kilometers

a motor homunculus represents a map of brain areas dedicated to motor processing for different anatomical divisions of the body.

homunculus represents the importance of various parts of your body as seen by your brain. as a result, they take up a lot of brain space. although the cortical homunculus is a curiosity, penfield's work in mapping the brain's relationship to the body was invaluable.

the answer is:

carbon dioxide