At first you have to write the variables out which are

now you have to combine like terms


now you add these two variables and end up with answer of
Answer:
Agriculture was the key development in the rise of sedentary human civilization, whereby farming of domesticated species created food surpluses that enabled people to live in cities. The history of agriculture began thousands of years ago. ... Pigs, sheep and cattle were domesticated over 10,000 years ago.
Explanation:
The answer is; C
The study of plant and animal life in an environment is known as ecology. Anthropology is mainly defined as the study of humans, their behaviors and societal norms and values (such as politics, culture, religion, and language), in the past and present.
Answer:
40
Explanation:
32 divided by 4 is 8, so just multiply that by 5 since that's the girls ratio and you get 40
The answer is either C or D. I’m not sure but i’m closer to D. Hope this helped!