Botulinum toxins are the most lethal toxins known. For type A toxin, the toxic dose is estimated at 0.001 mcg/kg (Franz 1997); the lethal dose for a 70-kg person by the oral route is estimated at 70 mcg, by the inhalational route 0.80 to 0.90 mcg, and by the intravenous route 0.09 to 0.15 mcg (Sobel 2005).
1 hectare = 2.47105381 acres. .07 hectare= .17 acres per person. about 7500 square feet per person. While this figure produces a result of around 5-6 people per acre, there are plenty of caveats to consider. If the soil is not ideal, increase the land. If the growing season is short, increase the land.
Determine how many acres you are converting to square miles. This number will probably already be given to you, but you can also use an area calculator map to determine the acreage of a real-world tract of land. For example, you might want to convert 2,500 acres to square miles. 3. Multiply the number of acres by 0.0015625{\displaystyle 0.0015625}. This decimal is a way of representing the ratio of square miles to acres, or 1640{\displaystyle {\frac {1}{640}}}, since, for every 1 square mile you have, you have 640 acres.