I think the above statement is false. I believe people use sugar substitutes and fat replacers for the purpose of helping control their weight, to limit the symptoms and risk of conditions such as diabetes, cardiovascular diseases adn cancer and to prevent tooth decay, the subject of whether the two helps in the indicated is debatable. However, current research does not show that they help people reduce calorie intake or prevent obesity.
The tissue that forms the outer surface of the body is a stratified squamous keratinized epithelium. The surface layer of dead cells(stratum corneum) is made to keep things out of the body, protecting it. The tissue that lines the digestive tract(e.g. intestine). Is made from 1 layer of columnar cells that facilitate the absorption of nutrients. Both tissues are epithelia.
Cutting down trees results in loss of habitat for many animals in the wild, because over 70% of animals that live on land live in trees! Cutting down trees can also reduce our oxygen.