Your answer would be C. tribal affiliation .
Answer:
The slope of the line is -1/2
Explanation:
The general equation of a line is

where
m is the slope of the line, which is the rate of change of the y-variable with respect to the x-variable
q is the y-intercept, which is the y-coordinate at which the line touches the y-axis
The equation of the line given in this problem is

Therefore, by comparing it with the general equation, we observe that:

Therefore, the slope of this line is -1/2.
Answer:
The Food-chain.
Explanation:
For example, animals at the top of the food-chain, in their ecosystem, balance the population. The organisms at the bottom are the producers. Herbivores usually eat the producers which are multiple types of plants. Omnivores and herbivores are prey for the carnivores, but they are also predators to the herbivores. That's all I could really think of... :)