Disease - Schistosomiasis
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Keystone Species
Keystone Species A keystone species is a plant or animal that plays a unique and crucial role in the way an ecosystem function. Without keystone species, the ecosystem would be dramatically different or cease to exist altogether. All species in an ecosystem, or habitat, rely on each other. The contributions of a keystone species are large compared to the species' prevalence in the habitat. Nevertheless, a small number of keystone species can have a huge impact on the environment. A keystone species is often, but not always, a predator. Just a few predators can control the distribution and population of large numbers of prey species. 1. HONEY BEES Honey bees are keystone species in their environment. We all know that honey bees are involved in the process of pollination which is one of the primary ways plants reproduce. Honey bees are responsible for the...
Developed Countries
1. Population Pyramid of Singapore Age structure: 0-14 years: 12.80 % (male 391,714 / female 373,766) 15-24 years: 16.00% (male 473,012 / female 489,553) 25-34 years: 21.30% (male 614,644 / female 664,018) 35-44 years: 16.40% (male 478470 / female 505,592) 45-54 years: 12.90% (male 383,414 / female 388,569) 55-64 years: 10.5% (male 316,001 / female 315,648) 65 years and above: 9.90% (male 274,863 / female 326,727) B ased on the latest United Nations estimation , t he current population of Singapore is 5,763,968. The population density in Singapore is 8274 per km 2 (21,430 people per mi 2 ) while t he total land area is 700 km 2 (270 sq. miles). The median age in Singapore is 40.5 years . As we can see the Singapore population pyramid has a contracting type. The gr...
Less Developed Countries
1. Population Pyramid of Madagascar Age structure: 0-14 years: 39.50% (male 5,119,804 / female 5,037,438) 15-24 years: 20.25% (male 2,608,996 / female 2,587,745) 25-34 years: 15.15% (male 1,940,425 / female 1,937,330) 35-44 years: 10.25% (male 1,314, 644 / female 1,319,037) 45-54 years: 7.05% (male 905,209 / female 910,171) 55-64 years: 4.45% (male 560,072 / female 581,963) 65 years and over: 3.35% (male 390,094 / female 470,682) A population pyramid shows the age and sex structure of a nation's population and may give bits of knowledge about political and social solidness, and additionally monetary improvement. The population is disseminated along the flat pivot, with guys appeared on the left and females on the right. The male and female population are separated into 5-year age bunches spoke to as flat bars along the vertical hub, with the most youthful age bunches at the base and the most...