A. reduce the need to use fossil fuels
The answer is (3) carbon atoms. For 2-butanol, it contains single bonds only and with C, O, H atoms. For 2-butene, it contains single bonds and double bonds both. And contains C, H atoms.
The second one is endothermic as endothermic reactions require energy for the reaction to take place.
The answer is: Survival of the form that will leave the most copies of itself in successive generations.
"Survival of the fittest" is a phrase that originated from Darwinian evolutionary theory.
This is example of natural selection and adaptation.
Genetic variation is important to the population's ability to survive in different situations that affect natural selection.
The environment is constantly changing and different alleles are favored.
