how many people does it take for repopulation?
596251
Ideally you would want the largest number possible. If you use too few people then there would not be enough variety in their genes.\n\nEventually the entire population's genes would be very similar and the members of the population would have similar strengths and weaknesses eg. if one member of the population is not resistant to a particular virus, then because of the genetic similarity to other members it is quite likely that the entire population would not be resistant. It would be possible for them to be wiped out by a single virus (or other threat).
859564
Historical estimates say about 200 million.  \n\nSorry, can't help you with the math...\n\nhttp://www.census.gov/ipc/www/worldhis.html\n\nPlus you're assuming a doubling of population every generation.  Not everybody had children.
87641
There are hundreds if not thousands of insects per each human so if you count them, fish, etc.  You have thousands to one.  If you want to count bacteria as animals then it is billions to one.
507575
no.  \npopulation- how many people\neconomy-study of a nations spending.
569207
I would guess at least 5 billion. How could you get a number anyways. I know there is census, but there are just way to many people to count like that, especially in places that are remote. Now I am curious lol.
397855
Nobody knows, approximately 2 million species have been identified as currently inhabiting the earth, but extrapolations based on the rate of discovery of species and other factors give figures ranging from 3 million to 80 million species.
75311
there are thousands - care to be more specific???
1005800
Exactly...it's hard to say because people are always dying and new lives are always coming into the world.  I would say just over 6 billion.
170577
I'm not sure what you are asking.  The number of people?  The kind of people?  or ????
908791
Many are available.\n\nplrr
153991
46, or 23 pair.\n\nThere is no average... this is the number all people have unless they have a flaw in their genetic makeup (very rare).
179650
No, but I do think that people should RESTRICT the number of children they have. If most couples restricted themselves to only two children, the our population would go DOWN, because some of these children would die in birth or from disease before they reached reproductive age.\n\n"Do we need to keep adding people to the planet?" The word "need" is, in this instance, subjective. Economically, it would be a very bad idea to stop adding people to the planet. For our /species/, it would be a very bad idea to stop adding people to the planet.\n\nAs for the website you referenced, what good is it for the Earth's biosphere to return to "normal" (a very subjective condition anyway) if humans aren't around to enjoy it?\n\nWe should probably restrict ourselves in the number of children we have. It is crazy to have 10 children in an age where overpopulation is so prevalent. Of course, this might also depend on where you life. It would be worse to have so many children if you lived in India than if you lived in the U.S.
873766
Lots of choices:\n6 boys and 21 girls\n9 boys and 18 girls\n12 boys and 15 girls\n15 boys and 12 girls\n18 boys and 9 girls\n21 boys and 6 girls\n\nWithout another piece of information (such as there are 3 more girls than boys, or twice as many boys as girls) there is no way to get a unique answer.
641839
humans have an estimated 100 trillion cells...
765076
The odometer just rolled over to 300,000,000 (three hundred million.  We are on our way to a Chinese like, or Indian like population.  When the population reaches a certain size it will begin to expand geometrically, (doubling, tripling, etc.)
572441
Every day 400000 babies are born, 150000 people die for a net increase of 250000 human beings a day. So it is approximately 3 to 1 as you guessed.\n\nCurrently the worldpopulation increases with 90 million a year, or about 1.4%. We are crowding 6500 million people on the planet.
609691
Billions and billions of people