Clark observes a pond ecosystem near his home and records the changes he
observes over a season for his science project. Ecosystems have important value for
the organisms within them.
Which of the following determines whether an ecosystem is healthy? Choose
the two that apply.
A. A food chain with several members
B. The number of organisms in an area
C. The variety of organisms in an area
D. Many natural resources
observes over a season for his science project. Ecosystems have important value for
the organisms within them.
Which of the following determines whether an ecosystem is healthy? Choose
the two that apply.
A. A food chain with several members
B. The number of organisms in an area
C. The variety of organisms in an area
D. Many natural resources