Carbohydrates are more easily metabolized than lipids. however, on a gram-for-gram basis lipids provide cells with more?

On a gram for gram basis lipids have the highest energy yield of all the food sources. 

Explanation; 
A gram of fat or lipids contains more than double the amount of energy present in a gram of carbohydrate. They yield 9 kcal of energy per gram while carbohydrates and proteins yield only 4 kcal of energy per gram. Most of the energy needed by the body is provided by the oxidation of carbohydrates and lipids.  Despite, lipids having more energy per gram than carbohydrates, carbohydrates are readily available. Additionally the conversion process is much less efficient because oxygen is required to burn fat.

1. true.2. true.3. true.4. false.5. true.the concept of darwin's theory of evolution involves the idea that there are limited resources in a given living environment and that the organisms which live within have variations in their genetic make up due to random mating. the ones with beneficial genetic variations can express certain traits which give them an upper hand in surviving and reproducing in the said environment compared to ones who may have a more disadvantageous variation in traits. over time, the organisms with an upper hand will survive and reproduce more frequently and pass on their beneficial genes while the others die. the result is evolution, where we observe (usually, but not always) eventually, phenotypic distinct changes.