Cows, buffaloes, elephants, monkeys, dogs and cats are all examples of multicellular organisms. Humans are the most complex of all multicellular organisms. All such organisms have billions of cells, tissues and different organ systems in the body.
All multicellular organisms may be seen with the naked eye, as they are large. Multicellular organisms have evolved from unicellular organisms. They have specialized cells for performing different functions. The cells of the heart are different from the cells of the liver and the brain.
As opposed to multicellular organisms, there are unicellular organisms, such as amoeba, paramecium, viruses of various kinds and bacteria. They do not have a well-defined organ structure or organ systems within their bodies.Learn More
Cells need oxygen for the efficient use of glucose in cellular respiration, the main method most organisms use to gain energy. The oxygen bonds to portions of the glucose molecule, releasing water, carbon dioxide and a large amount of energy. The cells then use that energy to generate adenosine triphosphate, commonly abbreviated as ATP, the main energy currency used by the cell.Full Answer >
Osmoregulation is an important process in both plants and animals as it allows organisms to maintain a balance between water and minerals at the cellular level despite changes in the external environment. Osmoregulators take up both minerals and water from the environment and have methods of expelling what they do not need and conserving what is in short supply.Full Answer >
Cell metabolism involves several complex biochemical reactions that occur in living organisms to maintain a normal life. These metabolic pathways are broadly classified as anabolism and catabolism.Full Answer >
Decomposers are organisms that break down rotting trees and plants. Mushrooms, beetles and wood eaters are some of the decomposers found in a deciduous forest.Full Answer >