none :) a bacteria is considered to be unicellular but there are many bacteria that live in clusters or are filamentous, in that case the intercellular interaction is more important and we can in a way see that as a multicellular organism. Theoretically a bacteria is unicellular , always !!
The multicelular organisms are found in all of life's kingdoms. Multicellular life has evolved independently dozens of times we belive, once for plants, once for animals, once for brown algae and perhaps several times for fungi, slime molds, and red algae. Multicellular bodies exists in both prokaryotes and eukaryotes, and first appeared several billion years ago in cyanobacteria. Thus the whole basis of your question is wrong, multicellularity is NOT a sound discrimination basis for classifying Earth's life forms.
All protists are eukaryotic (have a nucleus), most live in water. They are the "ancestor organisms" because they were the first organisms ever to exist.Protists are simply organisms that don't fit into any of the other kingdoms.The great diversity of form, habitat, mode of nutrition, and life history exhibited by eukaryotes suggests they evolved several times from various groups of prokaryotes. This makes the Protista a polyphyletic group. Eukaryotes are generally larger, have a variety of membrane-bound organelles, greater internal complexity than prokaryotic cells, and has a secialized method of cell division (meiosis) that is a prelude to true sexual reproduction. Protists might be viewed as a group from which the other eukaryotic kingdoms evolved.
Differentiation occurs several times during the development of a multicellular organism. The organism changes from a simple zygote to a complex system of tissues and cell types.
The four different branches evolved at different times, but have the same characteristics.
The cell division process that only occurs in specific cells and at specific times is called mitosis. Mitosis is a type of cell division that results in two daughter cells with the same number of chromosomes as the parent cell. It is essential for growth, repair, and maintenance of multicellular organisms.
yes it is but it can also be single at times.......
The multicelular organisms are found in all of life's kingdoms. Multicellular life has evolved independently dozens of times we belive, once for plants, once for animals, once for brown algae and perhaps several times for fungi, slime molds, and red algae. Multicellular bodies exists in both prokaryotes and eukaryotes, and first appeared several billion years ago in cyanobacteria. Thus the whole basis of your question is wrong, multicellularity is NOT a sound discrimination basis for classifying Earth's life forms.
Photosynthesis evolved multiple times in the history of life on Earth. It is believed to have evolved at least two separate times, leading to different types of photosynthetic organisms.
a multicellular organism is more advanced because a unicellular organism meets up to all its basic needs in just one cell which in a multicellular orgaism it does the same thing but with trillions of cells. So which do you think is more advanced?? Multi-cellular so pretty much no Actually, since a multicellular organism needs everything to function perfectly to sustain life, it has an easier chance of dieing if one little thing were to go wrong whereas a unicellular organism can surive in almost any enviorment
All protists are eukaryotic (have a nucleus), most live in water. They are the "ancestor organisms" because they were the first organisms ever to exist.Protists are simply organisms that don't fit into any of the other kingdoms.The great diversity of form, habitat, mode of nutrition, and life history exhibited by eukaryotes suggests they evolved several times from various groups of prokaryotes. This makes the Protista a polyphyletic group. Eukaryotes are generally larger, have a variety of membrane-bound organelles, greater internal complexity than prokaryotic cells, and has a secialized method of cell division (meiosis) that is a prelude to true sexual reproduction. Protists might be viewed as a group from which the other eukaryotic kingdoms evolved.
Organisms conserve energy by regulating their metabolic rate, engaging in periods of rest, and minimizing unnecessary movements. They also have efficient mechanisms for obtaining and utilizing energy from their environment, such as efficient digestion and metabolic processes. Additionally, some organisms have evolved adaptations like hibernation or torpor to conserve energy during times of scarcity.
Skarmory does not evolve.
If the why question is asking from a position of purpose, i.e. for what reason did multicellular organisms evolve from unicellular organisms, the question can only be answered from a religious or philosophical perspective. Science cannot impart motive to nature. If the why question is asking from a position of what the process was that lead from uncellular to multicellular organisms, the answer is simple. Selection pressures favored having numerous distinct cells that work in tandem over individual cells that did not and then further cells that were in complete union with each other over those that work in tandem. There are a number of intermediate steps between unicellular and multicellular organisms. Probably the most clear "midway" point is the colonial organism of which the extant Volvox is one of the best examples. (Admittedly Volvox itself is only 200 million years to present old, so it is not a remnant of this transition, but is similar to what scientists surmise was part of the transition that led to the development of multicellular organisms.) In a colonial organism, numerous unicellular organisms work in tandem to achieve goals (similar to how geese fly in flocks even though each is autonomous). The required communication would select cells that more effectively communicate with each other, leading to cells that can function as part of the same organism.
Early Dinosaurs that evolved from the Jurrasic times.
The four different branches evolved at different times, but have the same characteristics.
Differentiation occurs several times during the development of a multicellular organism. The organism changes from a simple zygote to a complex system of tissues and cell types.
Wings for powered flight have evolved multiple times in protostomes, with the best-known example being in insects. Other protostomes that have evolved wings for powered flight include some groups of arthropods, such as butterflies and dragonflies.