Aspecific mutation in a certain animal leads to abnormal development of the heart and kidney, resulting in miscarriage. why did this happen?

This most likely happened because "Nature kills the weaker organisms and selects only the strongest organisms, which can survive and flourish" although it should be clear that nature didn't cause this mutation, is "chose" not to select it

Explanation:

propane is burned to provide the heat in many cooking grills. the chemical reaction for this process is shown in the equation below.

c3h8 + 5o2 ? 3 co2 + 4h2o + energy

what are the products in this chemical reaction?

3co2 + 4h2o + energy