x A(n) __ is a collection of all of the abiotic factors and biotic factors in an entire region. x A habitat x B ecosystem C community D ecological niche

## Step 1<br />The problem is asking us to identify the term that represents a collection of all the abiotic (non-living) and biotic (living) factors in an entire region. The options provided are: A habitat, B ecosystem, C community, and D ecological niche.<br /><br />## Step 2<br />Let's define each term:<br /><br />### **Habitat**<br />A habitat is the natural environment in which a particular species of organism lives. It includes both the biotic and abiotic factors that affect the species.<br /><br />### **Ecosystem**<br />An ecosystem is a community of living organisms in conjunction with the nonliving components of their environment, interacting as a system. It includes all the biotic and abiotic factors in a particular region.<br /><br />### **Community**<br />A community in biology refers to all the different species living in a specific area.<br /><br />### **Ecological Niche**<br />An ecological niche is the role and position a species has in its environment; how it meets its needs for food and shelter, how it survives, and how it reproduces. It includes the physical, chemical, and biological factors that a species needs to survive, stay healthy, and reproduce.<br /><br />## Step 3<br />Based on the definitions, the term that best fits the description given in the problem is 'ecosystem'. An ecosystem includes all the biotic and abiotic factors in a particular region.