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because there is a limit to how big a single cell can be due to the reducing ratio volume/surface area. when the ratio is below a certain limit the diffusion of chemicels in or out of the cell gets too slow
Wiki User
∙ 16y ago
Wiki User
∙ 15y agoJust a couple of thoughts. As cells get bigger, the components (used to be called organelles but I guess that's changed) get further from the cell walls or membranes. Given the limitations of transport mechanisms within cells, their ability to interact with the cell exterior would eventually be limited to such an extent that the cell would no longer be viable (volume:area). This logic would suggest that cells that do not require much interaction could be comparatively big e.g. some plant and animal structural cells or human eggs (not sure where ostrich eggs fit - are they uni or multi cellular structures?). But, this logic is based on a vision of a cell as a sphere and, by elongating, flattening or other deviation from the sphere, cells can grow larger whilst maintaining effective interaction with the cell exterior e.g. nerve and skin cells.
Wiki User
∙ 12y agoIt has to do with surface to volume ratio. Cells must exchange gas through the membrane, and it must exchange enough gas to service the entire cell. Imagine how the volume and surface area change when you blow up a balloon. As the balloon expands, there is less surface area to compensate for the increase in volume.
Wiki User
∙ 8y ago"because they only have on one cell, and to grow larger they need to add more cells to their body, which they cant do" - this is what another dude said but I'm not sure it's accurate. I mean if you're in AP Bio, then it's a totally different answer.
Single cell organisms can't be any larger than they already are because they need to be able to transfer energy as fast as possible. But if the single celled organism is the size of a person then that cell will die because of the energy takes time to go through the cell. And it needs to be fast enough to feed the cell.
diffusion of nutrients into the cell's interior would be too slow
Wiki User
∙ 14y agothey don't have the organelles like we do. we are multicellular organisms
Angelos Panopoulos
i dont kjnwo
Angelos Panopoulos
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What is the difference between unicellular and multi cellular organisms?
A "multi cellular" organism has a body made out of more than one cell. Humans are multi cellular organisms. A "unicellular" organism has a body body made out of just one cell. An amoeba is a unicellular organism.
What is a uniceller organism?
A unicellular organism is one that only contains one cell and is very small in size, therefore being very simple. There also known as prokaryotes, they do not have a nucleus.
Suppose you saw a small organism move across your desk How would you infer that this oranism was multicellular or a single cell?
unicellular because it starts out as one
What is a microscopic one celled animal?
Usually a unicellular organism.
Identify body cells with a structure that is similar to that of a unicellular organism?
Both unicellular cell and Body cell, specifically in the nose, have the structure called Cilia. Some unicellular cells use it for locomotion (mobility). On the other hand, humans use it as filter in their nose. They are the small hairs in human nose..
Why do you need a microscope to see a unicellular organism?
we need microscope to see unicellular organism because they are very small
What is simple single celled microorganism?
Because micro means small and a single celled organism is typically rather small.
Is a cell a complete organism?
There are unicellular organisms - that is a single cell that is an organism. However, for multicellular organisms, such as animals - a cell is only a small part of the whole organism.
Why cell can be an organism?
Just Because it's so small does not mean it isn't an organism. == Answer== Some organisms are unicellular, meaning that are composed of only one cell. Life started as unicellular organisms which turned more complex later.
Why a cell can be an organism?
Just Because it's so small does not mean it isn't an organism. == Answer== Some organisms are unicellular, meaning that are composed of only one cell. Life started as unicellular organisms which turned more complex later.
What is the difference between unicellular and multi cellular organisms?
A "multi cellular" organism has a body made out of more than one cell. Humans are multi cellular organisms. A "unicellular" organism has a body body made out of just one cell. An amoeba is a unicellular organism.
What is a uniceller organism?
A unicellular organism is one that only contains one cell and is very small in size, therefore being very simple. There also known as prokaryotes, they do not have a nucleus.
Why are multicellular organisms more efficent than unicellular organisms?
Multicellular organisms work like an assembly line, and if one part of a multicellular organism dies, it can be replaced, but if a part of a unicellular organism dies, the entire organism dies. The assembly line process is called specialization.
Grass is unicellular or multicellular?
Yes, grass is multicellular. If you can see the organism, and it is living (like a plant or an animal), then it has more than one cell, and is called 'multicellular'. Cells are extremely small and cannot be seen without a microscope.
Is a red kangaroo a multicellular organism?
Yes. One celled or unicellular organisms are so small you would need a strong microscope to see one.
Suppose you saw a small organism move across your desk How would you infer that this oranism was multicellular or a single cell?
unicellular because it starts out as one
Is a boa constrictor multicellular or unicellular?
It is multicellular. Unicellular organisms are too small to see.
