What is the first srep in evalidating in espresion below

Here are the steps for evaluating an expression: Replace each letter in the expression with the assigned value. First, replace each letter in the expression with the value that has been assigned to it. To make your calculations clear and avoid mistakes, always enclose the numbers you're substituting inside parentheses.

Explanation:

d.he wanted to send diplomats to communist countries.

food chain i would say only because there is competition on getting food and survival