All the populations living and interacting within a particular geographic area make up a biological (or biotic) community. The living organisms in a community together with their nonliving or abiotic environment make up an ecosystem.
Maintaining a healthy lifestyle through diet and exercise is important because the world is rapidly advancing and this rapidness has brought many health concerns. Today's lifestyle is extremely stressful for any age group and without proper diet and exercise, one cannot cope up with his/her daily routine.
<h3>Benefits of Diet and Exercise:</h3>
- It helps in dietary nourishment and proper intake of nutrients.
- Exercising keeps a check on calorie intake.
- Proper supplements with exercise helps in muscle development and removal of bad body fat.
- A person with a good diet and regular exercise can attain good physical and mental well-being.
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A, definitely A. The A example, only the tapeworm gains something, the mammal doesn't gain anything whilst in the other examples, both the organisms gain something, for example in B the remora can remove parasites which is good for the fish and provide the remora with food.
