It should be natural selection since there is no external influence implied. (like environment or genetic mutations.)
Answer:
American's portion sizes have become larger in the last decade due to the expanding of food industries and marketing campaigns that tell us to eat more.
Explanation:
The growth of food industries in the last decades to obtain more money in combination with the media influence has led us to eat more, thus why the size of our portions has increased their size.
Another theory states that people always want to eat more, and the industry has only fulfilled this demand, but it is not clear why, in the past, this did not happen.
Answer:the body uses lipids as an energy store,as insulation and to make cell membranes.
Explanation:lipids include fats(solid at room temperature) and oils (liquor at room temperature).lipids are an important part of healthy diet.
Answer:
Antibiotics are routinely introduced into the food of cattle, chickens and other livestock, which causes the animals to grow faster but the negative effect of using antibiotics is the development of antibiotic-
resistant bacteria.
When we use antibiotics at large scale some bacteria that live in these cattle become resistance to these antibiotics and then these resistant bacteria are shed in the soil through poop of animals.
Bacteria have the capability to transfer antibiotic-resistant genes to other bacteria by horizontal gene transfer mechanism so it can give rise to more antibiotic-resistant bacteria which can infect humans.
So when these resistant bacteria infect humans then if we take the antibiotics which the bacteria are resistant for then the antibiotic will not able to protect the patient.
Therefore, this practice could affect the probability of developing populations of antibiotic-resistant bacteria that cause human disease.