A dead tree is home too many organisms including fungi insects and some small animals. This is an example of an

A. Population
B. Community
C. Ecosystem
D. Species

Consider the following scenario

Every year the tropical rainforest has a rainy season. The first floor floods covering once dry areas with water. Some organisms are unable to tolerate The increased water so they have to move to other locations to survive.

Which word can best be used to describe this scenario.

A. Damming
B. Disturbance
C. Predation
D. Biodiversity.

Which situation is an example of interspecific competition.

A. Maple tree seedlings competing for sunlight.
B. Bacteria living in the human Colon
C. Alligators hunting fish.
D. A snake and fox hunting mice

Which change would create a new ecosystem.

A. A yearly migration.
B. A dam flooding a valley
C. An introduced species
D. I lake freezing over

Please help with these last answers