There are 150 Saguaro cactus plants per square kilometer in a 10-square-kilometer area of Arizona desert. To which population characteristic does this information refer

Population Density.

Explanation:

Population density, this is known as the number of people per unit of area, it is usually denoted with per square kilometre or square mile, population density can be calculated for a county, city, or plants as in this question.

Which tells us the population density of saguaro cactus plant to be 150 per square kilometres.

the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%