Mutations of any different species of different backgrounds, will affect the growth of an animal. For instance an organisms DNA affects how it looks, behaves and its physiology. So the change in the organism's DNA can cause in all aspects of its life. A mutation itself is vital, or essential to evolving. Its a raw material of a genetic variation.
Your lungs can be very badly affected by smoking. Coughs, colds, wheezing and asthma are just the start. Smoking can cause fatal diseases such as pneumonia, emphysema and lung cancer. Smoking causes 84% of deaths from lung cancer and 83% of deaths from chronic obstructive pulmonary disease (COPD).
Contagious diseases is your answer, as Contagious diseases spread from person to person via physical touch & through the air when someone sneezes of coughs
hope this helps
Answer:
Mechanical digestion involves physically breaking the food into smaller pieces. Mechanical digestion begins in the mouth as the food is chewed. Chemical digestion involves breaking down the food into simpler nutrients that can be used by the cells. Chemical digestion begins in the mouth when food mixes with saliva.
Explanation:
