Consider the cooling curve above. the substance is changing state from a gas to a liquid to a solid. as the temperature changes we also know that a. there is a decrease in molecular attraction and kinetic energy. b. there is a decrease in kinetic energy and the molecules get closer together. c. kinetic energy increases while potential energy decreases during the phase changes. d. although the molecules get closer together, there is no real change in the energy of the molecules.

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.