The polar bear is part of the Arctic ecosystem and a food web through which carbon cycles. The ecosystem comprises phytoplankton, algae, a variety of animals and the natural environment.Know More
The polar bear itself has no natural predators within its ecosystem and is thus supported by every other member of it, from the phytoplankton and algae that convert carbon dioxide from the ocean into organic carbon tissue to fish that feed on them, walruses and whales.
Unfortunately, scientific knowledge of the Arctic ecosystem is limited, owing to its inhospitable weather and the expense of mounting expeditions. Nevertheless, research has demonstrated conclusively that global warming is gradually and irrevocably destroying it.Learn more about Bears
A food web is a comprehensive map of how energy moves, in the form of food, throughout an ecosystem, while a food chain is one specific path through the web. Most food webs on Earth derive their energy primarily, if not exclusively, from sunlight. That energy is captured by plants via photosynthesis and then distributed to the consumers in the environment.Full Answer >
A food web is an illustration of the food chains that occur in a given ecosystem. Where a food chain traces nutrients along a single line from producer to apex predator, a food web illustrates the complex predator-prey interrelationships between living things.Full Answer >
An amoeba functions as a part of the food web as a consumer and scavenger. This organism feeds on dead matter as well as other small organisms such as algae and protozoans. The amoeba in turn provides food for water fleas and mussels.Full Answer >
Adult male black bears can weigh between 150 and 600 pounds, and adult females usually weigh between 90 and 300 pounds. Newborn cubs weigh about 8 to 12 ounces.Full Answer >