ecosystems

Look again at the illustration of wildlife in a game reserve . There is ____________________ between the different populations to form a ____________________ . If we now study the communities' interaction with the non - living things in their environment , then we are studying ____________________ at the ecosystem level .
Think of the different populations of organisms that form a ____________________ in the Kruger National Park , such as zebras , elephants , lions , springboks , different types of trees and grasses . Now look at this photo of some of these populations at a watering hole . In this photo , we study the interaction between the living organisms and the non - living environment . As an example , the zebra and springbok drink water , while the elephant pours mud over itself to cool off . It is an ____________________ .

Every living ____________________ on Earth depends on , and interacts with , other living and non - living things to survive . For example , organisms depend on other ____________________ for food and depend on their ____________________ for protection and shelter . This particular branch of the sciences that studies the interaction of organisms with other organisms and their environment is called ____________________ . A person who studies these relationships and interactions is called an ____________________ .

The ____________________ interactions that take place in a specific area are usually divided into four levels : ____________________ , communities , ecosystems and the ____________________
Individuals live together in ____________________ . Different populations collectively form a ____________________ . Communities , together with the non - living things in their environment , form an ____________________ . All the ecosystems on earth are called the ____________________ .