students must design a device that uses 25 grams of reactant 1 and produces the maximum amount of heat with the smallest amount of reactant 2. How much of reactant 2 should they use to meet the criteria of the sesign challenge?

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

i think that it is plants

the main thing i would use is bricks because if there is a hurricane, there is a great possibility for the house to still stand. and i would also use plexiglass windows instead of regular windows because plexiglass isn't prone to breaking.