<span>Pond organism is unicellular and crab is multi cellular.
The simplest level at which life exist is called the cell. Unicellular organism contain only one cell while multi cellular organisms contain more than one cell. Multi cellular organisms can be organized into various levels such as Cells>tissues> organs>organ systems> organism. Thus pond organism is unicellular under microscope and crab is multi cellular.</span>
Answer:
no we havent
Explanation:
The last one was 26,500 or 74,000 years ago.
The third law of motion says: for every action, there is and equal and opposite reaction. In the case of the octopus, this is nicely demonstrated with it's method of travelling. The octopus makes an action, which is it shooting water at high rates in a certain direction, and the equal and opposite reaction is that the octopus's shooting of water in certain direction, moves him into the opposite direction with the rate that it is shooting the water.
The answer is smallet is size.
<h3>What is electrode?</h3>
- Electrode, electric conductor, usually metal, operated as either of the two terminals of an electrically operating medium; it conducts current into and out of the medium, which may be an electrolytic resolution as in a storage battery, or a solid, gas, or vacuum.
- The main use of electrodes is to generate electrical current and pass it through non-metal objects to essentially alter them in several ways. Electrodes are also used to calculate conductivity.
- The electrode is the location where electron transfer happens. An electrode is classified as either a cathode or an anode counting on the type of chemical response that happens. If an oxidation reaction happens at an electrode.
To learn more about electrode, refer to:
brainly.com/question/25712870
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Answer:
- Both organelles present their genetic material.
- Both organelles divide by binary fission
- Both organelles present a double membrane, the internal one looks identical to the bacterial membrane, while the external membrane looks like the eukaryotic one.
- In the internal membrane are placed the energy centers, just as it occurs in bacterias membrane.
- The sizes of the organelles are similar to the size of some procaryotes
Explanation:
The endosymbiotic theory essentially states that some organules of the eukaryotic cells, such as mitochondria and chloroplasts, were once free-living bacteria. Probably, these organisms must have been phagocytized but not digested by another cell. These bacteria were able to adapt to their host, establishing a bond of dependence among each other.
Both organelles have many similarities with other free-living bacteria. For this reason, the theory states that chloroplasts derivate from cyanobacteria (because they both absorb sunlight, store the energy in ATP, and produce organic molecules) and that mitochondria derivate from rickettsias (because they produce ATP in the same way, by using the Krebs Cycle and Oxidative Phosphorylation).
This theory is supported by a few characteristics of the chloroplasts and mitochondria that suggest that they once were free cells. For example,
- Both organelles present their genetic material. This DNI is independent of the cells´ DNA, is bi-catenary and circular, identical to the bacterial DNA, and very different from the one of the eukaryotic cells.
- Both organelles divide by binary fission, not by mitosis, and can synthesize their ribosomes and organelles.
- Both organelles present a double membrane, a characteristic that reinforces the idea of being phagocyted. The internal membrane looks identical to the bacterial membrane, while the external membrane looks like the eukaryotic one.
- In fact, in this internal membrane are placed the energy centers, just as it occurs in bacterias membrane.
- Finally, the sizes of the organelles are similar to the size of some procaryotes
