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Cells are divided into two main classes, initially defined by whether they contain a nucleus. Prokaryotic cells (bacteria) lack a nuclear envelope; eukaryotic cells have a nucleus in which the genetic material is separated from the cytoplasm. Prokaryotic cells are generally smaller and simpler than eukaryotic cells; in addition to the absence of a nucleus, their genomes are less complex and they do not contain cytoplasmic organelles or a cytoskeleton . In spite of these differences, the same basic molecular mechanisms govern the lives of both prokaryotes and eukaryotes, indicating that all present-day cells are descended from a single primordial ancestor
Just found an article about it explaining everything
check it out (delete the spaces in the link and skip the ad there)
exe.i o/evolution-of-cells
This one might be usefull too, explained in simpler words.
exe.i o/evolution-of-cells2
Alexander Khalturin
Wiki User
∙ 13y agoPeople think that evolution is the answer...But it is not. In reality, scientist have found that evolution cannot be. For example: If monkeys really turned into humans after time then how come us humans do not keep on changing. We would have seen change if it was happening by now. So the answer to your question: How has the cells of animals changed as animals have evolved...Is none. Animals do not evolve even though some people still believe in evolution.
Wiki User
∙ 12y agoThe answer is in the three rules of Cell Theory it is number three.
1. The cell is the basic unit of structure.
2. The cell is the basic unit of function.
**3. All cells must arise from pre-existing cells.** :D
Wiki User
∙ 16y agoSee the Related Links for "Evolution: Definition and Much More from Answers.com" to the bottom for the answer.
Wiki User
∙ 14y agoabout the four aspect of natural selection
Wiki User
∙ 14y agosome have,some havent
Wiki User
∙ 6y agoCells are the first life form, everything else evolved from them (including viruses).
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Are mitochondria found in plants cells animals cells or both?
Both animal and plant cells have mitochondria.
What must be true if prokaryote evolved into eukaryotes by absorbing other cells?
If prokaryotes evolved into eukaryotes by absorbing The ability to absorb other cells gave a survival advantage. other cells,
Do plant cells have chloroplasts and animal cells do not?
Plants carry out photosynthesis - which occurs in the chloroplast. Animals cannot photosynthesize.Plant cells have evolved a way to use light to provide energy for photosynthesis. The chloroplasts contain the pigment chlorphyll which allows them to utilize the energy from light. Animal cells evolved without the cellular machinery to perform photosynthesis, therefore they do not have chloroplasts and are heterotrophs, needing to feed on another organism in order to survive.
Why animal cells do not contain chloroplasts?
Animal cells are not capable of photosynthesis hence these cells lack chloroplasts. We can also put it this way, that since animal cells lack chloroplasts, these are not capable of photosynthesis.
What cell do scientists think evolved about 1.5 billion years ago?
Scientist believe that prokaryotic cells evolved 1.5 billion years ago.
How did mankind begin if we evolved from animals Where did living cells first come from?
Nobody has the exact answer to how mankind began. It is thought that the first living cells came about due to the combination of enzymes in the sea or from a meteorite falling to earth. Eventually humans evolved from these cells and animals.
What changed the composition of the ancient atmosphere on Earth?
When plants and animals evolved, this made changes in the atmosphere on Earth
Why are mollusks classified as animals?
Because they are - they eat and move and breathe and are made of animal cells (nucleus, mitochondria, no chloroplasts). They evolved from the common ancestor of animals. They are animals in everything.
Why would such great similarity between plant and animal cells exist and so few differences exist?
All plants and animals (multicellular and unicellular) evolved from a single type of cell. As the cell evolved only a few traits were changed each time while the basic patten of the DNA stayed the same.
What animals were on earth when man evolved?
Mostly the same types of animals that we have now, or their immediate predecessors. Humans are a relatively young species; not much has changed since we arrived.
What is cellular organization?
It basically means all cells are divided into two types: prokaryotic cells and eukaryotic cells. Prokaryotic cells evolved 3.5 billion years ago and have a nucleus. Examples of a Prokaryotic cell include protista, fungi, plants and animals. Eukaryotic cells evolved 1.5 billion years ago and do not have a nucleus. An example of a Eukaryotic cell is bacteria.
How did animals evolve into modern animals?
Animals ended up evolving in to the modern day animals today because the work use to be connected together into one big supercontinent then it all separtated into smaller continents and eventually became like the world we know today. As all the continents separated the animals changed as well. This is because the climates changed as the continents changed so the animals evolved to suit those conditions. For example most of the native animals of Australia are very different to the ones anywhere else in the world this is because Australia has been separated from the rest of the world for an extremely long time so the animals have evolved differently from animals anywhere else in the world.
Which organelle indicates that eukaryotic cells have evolved from prokaryotic cells?
The mitochondria and the chloroplast provide evidence that eukaryotic cells may have evolved from prokaryotic cells.
Are mitochondria found in plants cells animals cells or both?
Both animal and plant cells have mitochondria.
How were zebra and quagga genes passed on from the parents to the offspring?
the sperm cells from the zebra evolved in the offspring making female eggs and when zebras drank the offspring, they changed into quagga
1 animal that has been evolved?
Virtually all animals have "evolved".
Are viruses old prehistoric cells or are they highly evolved cells?
viruses dont have cells
