The correct answer from the space provided is electron transport chain. It is because this allows the proteins from utilizing the energy that has been produced in which the electrons are being transferred to the redox reaction in which creates the process called the chemiosmosis.
Being a living example of a tobacco-free lifestyle can: all of the above.
All of the listed options is an example of a tobacco-free lifestyle. It could certainly prevent others from trying to smoke, convince others to stop smoking, and make others around you more healthy.
A skin cell and a fertilized egg cell. They are both diploid cells, meaning that they have two sets of chromosomes, one set from each parent. A frog’s skin cell has gotten its genetic makeup from both its parents and a fertile days egg cell has two sets of chromosomes as well. A sperm cell and an egg cell are haploids, meaning they only have one set of chromosomes. So the answer would be A.