Question

greg wants to build a tree house. he wants the house to last for a long time and to not be broken down by rain, snow, and wind. which of the following would help greg to choose a durable building material?
oa. build several models of his tree house out of different materials, and see which model holds up best to wind, water, and ice.
ob. build one model of his tree house out of one type of material, and then freeze it in his freezer to see how well it holds up to the cold.
oc. build his tree house out of the material that seems the strongest, and then test the material with water, ice, and wind.
od. build his tree house out of several different materials, and see which part of the house holds up the longest.

Explanation:

To choose a durable building material, Greg needs to test different materials under relevant conditions (wind, water, ice). Option A tests multiple materials in the right conditions. Option B only tests one material and only for cold. Option C builds the actual tree - house first which is not a good test method. Option D tests parts of the house made of different materials but not the whole model under all relevant conditions.

Answer:

A. Build several models of his tree house out of different materials, and see which model holds up best to wind, water, and ice.