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A freshwater aquatic food web. The blue arrows show a complete food chain (algae → daphnia → gizzard shad → largemouth bass → great blue heron). A food web is the natural interconnection of food chains and a graphical representation of what-eats-what in an ecological community.
A Guyanese historian, Walter Rodney, posits that foreign ownership of African natural resources is the "most direct way" that rich countries continue to dominate African states without formally colonizing them: "When citizens of Europe own the land and the mines of Africa, this is the most direct way of sucking the African continent." [9]
Some statistics on this page are disputed and controversial—different sources (OPEC, CIA World Factbook, oil companies) give different figures. Some of the differences reflect different types of oil included. Different estimates may or may not include oil shale, mined oil sands or natural gas liquids.
Food chain in a Swedish lake. Osprey feed on northern pike, which in turn feed on perch which eat bleak which eat crustaceans.. A food chain is a linear network of links in a food web, often starting with an autotroph (such as grass or algae), also called a producer, and typically ending at an apex predator (such as grizzly bears or killer whales), detritivore (such as earthworms and woodlice ...
There are two major food chains: The primary food chain is the energy coming from autotrophs and passed on to the consumers; and the second major food chain is when carnivores eat the herbivores or decomposers that consume the autotrophic energy. [16] Consumers are broken down into primary consumers, secondary consumers and tertiary consumers.
According to BMC, "Nigeria is Africa's energy giant. It is the continent's most prolific oil-producing country, which, along with Libya, accounts for two-thirds of Africa's crude oil reserves. It ranks second to Algeria in natural gas. [8] Most of Africa's bitumen and lignite reserves are found in Nigeria. In its mix of conventional energy ...
Russia's top diplomat pledged help and military assistance while on a whirlwind tour of several countries in Africa's sub-Saharan region of Sahel this week, as Moscow seeks to grow its influence ...
Equatorial Guinea has Africa's highest GDP per capita. Oil-rich countries such as Algeria, Libya and Gabon, and mineral-rich Botswana have emerged among the top economies since the 21st century, while Zimbabwe and the Democratic Republic of Congo are potentially among the world's richest nations by natural resources, but have sunk into the list ...