0:07 did you know that some organisms exist
0:11 of just one cell these simple organisms
0:14 like amoeba are unicellular they depend
0:17 on simple diffusion for life they're
0:19 usually too small to be visible with the
0:22 naked eye like bacteria and so we need a
0:24 microscope to see them but there are
0:27 some unicellular algae is there about 15
0:30 to 20 centimeters in size or other
0:33 organisms are multicellular they consist
0:36 of multiple cells and are more complex
0:39 the vast majority of plants and animals
0:42 are multicellular being multicellular
0:44 allows organisms to be larger and have
0:48 south differentiation the different
0:50 types of cells to carry out different
0:53 tasks groups of cells then function in
0:56 the same way to form tissues or organs
0:58 these specialized organs carry out our
1:01 life processes working together in
1:05 systems unicellular organisms can carry
1:08 out all life processes in just the one
1:12 cell using internal structures called
1:16 organelles the decreased ability to
1:18 share out life's processes means
1:21 unicellular organisms have a low level
1:24 of efficiency whereas multicellular
1:26 organisms are highly efficient with
1:29 division of labor at the cellular tissue
1:32 or organ system level unicellular
1:34 organisms cannot grow large because
1:37 they're limited by a surface area to
1:40 volume ratio whereas multicellular
1:42 organisms can increase the number of
1:45 small cells to give it a large size
1:49 overall multicellular organisms have
1:51 long lifespans because individual cells
1:54 have a relatively smooth workload
1:57 whereas the hard-working single cell of
2:00 a unison organisms has such a heavy
2:02 workload that it can only maintain a
2:06 very short lifespan I don't need to tell
2:08 you how we get nutrition
2:11 but how does a single cell manage it
2:14 usually by phagocytosis where the food
2:16 is engulfed and installed in food
2:20 vacuums inside the organism all
2:23 prokaryotes are unicellular eukaryotes
2:27 can be uni or multicellular organisms we
2:29 look at the difference between pro and
2:32 eukaryotes in this video and we'll
2:34 discover why the statement that that all
2:37 prokaryotes are unicellular is continued
2:40 by some scientists as well as
2:43 prokaryotes most protests and some fungi
2:46 like yeast are also unicellular so then
2:48 we have unicellular and multicellular
2:51 organisms final thought to leave you
2:53 with is that injury to the south of the
2:56 unicellular organism can cause death
2:58 then one cell is everything to them
3:01 whereas injury or death of some cells in
3:03 multicellular organisms shinnok was a
3:05 problem those cells can simply be
3:07 replaced if you liked the video give it
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