Stationary population pyramids are representative of countries with shorter than average life expectancies.
(a) true
(b) false

False

Explanation:

The population age pyramid is the representation of different age group people of different places. There are 4 types of population pyramid, among them stationary population is one. This is also known as a stable population. In this pyramid, the pre-reproductive, reproductive and post-reproductive groups have coordination. That means the birth rate and death rate are equivalent.  The young population is more but not more than the old groups. Thus the stability in the population has maintained. This stability is due to high living conditions. The stable population pyramid is common in developed countries. The stationary population pyramids are representative of countries with high life expectancies.

wheres the options ? : (

explanation:

"a.) well–developed vascular system."