B. They want to show their strength.
7. What are the beneficial interactions among living
A. parasitism and predation
B. predation and competition
8. Which of the following pair of organisms has harm
A. A snake and a rat
B. Butterflies and flower
9. How does parasites and predators help maintain
A. They increase the population of all organ
B. They decrease the population of certain
C. They increase the survival of all species.
D. Any of the above are possible.
10. How does competition between organisms ma
A. The winners of the competition increase
B. The population sizes are kept in check di​