A Few More General Suggestions

We're Catholic.  Many of my home-school friends have large families.  Consequently, both money and time are in short supply.  Chose family friendly school projects.  For example, the S. family raises German Shepherd puppies as income. My suggestion for science projects include  researching and creating pedigree charts and color coat Genetics.  Another friend raises and sells rare breeds of chicks--loads of science, incubation, life cycle, nutrients in feed, pest management, coop design, etc.  You can build an incubator and keep records.  What is the average hatch rate?  According to Vetmed at University of California Davis it can range from 50-75%.  (This site has an article about incubation with tips.) BTW, Walmart sells an incubator under $75, identical to the ones used in elementary schools.  Another home-school family raised Crested geckos.  A teacher friend raised Poison Dart frogs in large aquariums.  (They aren't poisonous when raised domestically, owing to their diet.). They are pricy!  Bunnies are much easier and less expensive to buy or adopt.  Another good project is to estimate the cost to maintain and breed rabbits.  Which breed?  Do you plan to raise pets or rabbits for meat?  Here are sample calculations.  How many rabbits?  What is the cost of feed?  Is there a farm supply nearby where the feed is cheaper?  Do rabbits need supplements?  Will alfalfa or other grains provide needed nutrients?  How much is a hutch?  What price should you set to make a profit? Do you know a farmer willing to take the rabbits if the project proves too costly or too much trouble?  See what I mean about animal projects?  I love the fact they provide loads of science, consumer math, and basics economic lessons.