Add spaces: Theycomeridingonhorseback,towingbehindthem3-4cowsandawoodenwagon.

Answer: They come riding on horseback, towing behind them 3-4 cows and a wooden wagon.
Forinstance,youcan'tbuildanapartmenthousewithoutknockingdownthetenementthatstoodtherebefore.

For instance, you can't build an apartment house without knocking down the tenement that stood there before.
[Q]: [c)ispartofalargerenvironment(anothersystem);]
[A]: [c) is part of a larger environment (another system);]
Problem: Add spaces: Afriendfromschoolweregoingtoa60yearoldBirthdayandneededacard,afteradescribtionoftheBirthdayBoythisistheresult:)

Spaces added: A friend from school were going to a 60 year old Birthday and needed a card, after a describtion of the Birthday Boy this is the result :)
This text is missing some spaces, please add them: Digitalart,Digitalart
Digital art, Digital art
[Q]: [BeforebuyingavacuumcleanerDysonDC26Allergyspecifyallyouroptions,equipment,appearanceandwarrantyfromtheseller.Pleasenotethatwearenotengagedinthesaleandmanufacturewarranty.]
[A]:
[Before buying a vacuum cleaner Dyson DC26 Allergy specify all your options, equipment, appearance and warranty from the seller. Please note that we are not engaged in the sale and manufacture warranty.]