Answer: A semi-permeable membrane is that which only allows certain
substances to pass through.
Paratism is the practice of living as a parasite in or on another organism. Mutualism is the way two organisms of different species exist in which each individual benefits from the activity of the other.
Answer:
The DNA of any individual possesses genetic traits which vary from individual to individual. Traits can be physical traits or behavioral traits.
Explanation:
Example of a physical trait would be the appearance of an individual and behavioral trait refers to the nature of the individual. Both vary from individual to individual.