I need the answers of the questions. The highlighted ones are the ones I chose but I'm not sure if its correct.

Question

ECOSYSTEMS 

  An ecosystem is a group of animals and plants living in a specific region and interacting with one another and with their physical environment. Ecosystems include physical and chemical components, such as soils, water, and nutrients. These components support the organisms living in the ecosystem.

 Ecosystems can also be thought of as the interactions among all organisms in a given habitat. These organisms may range from large animals to microscopic bacteria and work together in various ways. For example, one species may serve as food for another. 

People are part of the ecosystems where they live and work. Human activities, such as housing developments and trash disposal, can greatly harm or even destroy local ecosystems. Proper ecosystem management is crucial for the overall health and diversity of our planet. We must find ways to protect local ecosystems without stifling economic development.

QUESTIONS 

1. Which sentence best expresses the main idea of this passage? 

a. Our actions can have a great impact on our ecosystems. 

b. Ecosystems have been badly managed in the past. 

c. Humans must clean up their trash. 

d. Ecosystems interact with one another. 

2. Which of the following best sums up the activities within an ecosystem? 

a. predator–prey relationships 

b. interactions among all members 

c. human–animal interactions 

d. human relationship with the environment 

3. An ecosystem can most accurately be defined as a. 

a specific place. 

b. a community of plants and animals. 

c. a group of animals working together. 

d. a protected environment. 

Answer 1

1. Ecosystems interact with one another.
2. Interactions among all members.
3. a protected environment.