in population pyramid, the left hand side of pyramid is used to show base.
in population pyramid, the left hand side of pyramid is used to show base.
in population pyramid left hand side of pyramid is used to show?
base
a population pyramid gives a clear picture of how a country transitions from high fertility to low fertility rate. the broad base of the pyramid means the majority of population lies between ages 0–14, which tells us that the fertility rate of the country is high and above population sub-replacement fertility level. the older population is declining over time due to a shorter life expectancy of sixty years. however, there are still more females than males in these ranges since women have a longer life expectancy. as reported by the "proceedings of the national academy of sciences," women tend to live longer than men because women do not partake in risky behaviors. also, weeks' "population: an introduction to concepts and issues," considered that the sex ratio gap for the older ages will shrink due to women's health declining due to the effects of smoking, as suggested by the united nations and u.s. census bureau. moreover, it can also reveal the age-dependency ratio of a population. populations with a big base, young population, or a big top, an older population, shows that there is a higher dependency ratio. the dependency ratio refers to how many people are dependent on the working class (ages 15–64). according to weeks' "population: an introduction to concepts and issues," population pyramids can be used to predict the future, known as a population forecast. population momentum, when a population's birth rates continue to increase even after replacement level has been reached, can even be predicted if a population has a low mortality rate since the population will continue to grow. this then brings up the term doubling time, which is used to predict when the population will double in size. lastly, a population pyramid can even give insight on the economic status of a country from the age stratification since the distribution of supplies are not evenly distributed through a population.
population pyramid
blochius









































blochius is a genus of prehistoric fish from the eocene. it is the only genus of blochiidae family. it was described by giovanni serafino volta (1764-1842) in 1800.









































section::::description.









































"blochius" was about 60 cm long and had a very slender elongated body, a narrow head with elongated upper and lower jaws and large eyes.









































section::::species.









































bullet::::- "blochius longirostris" volta, 1796









































bullet::::- "blochius macropterus" de zigno, 1887









































bullet::::- "blochius moorheadi" eastman, 1911 (nomen dubium)









































section::::references.









































bullet::::- "blochius", paleobiology database









































bullet::::- harry l. fierstine: "fossil history of billfishes (xiphioidei)." bulletin of marine science, volume 79, issue 3, januar 2006, seiten 433-453 abstract
blochius