give me currect answer$\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_?$What theoretical frameworks form the backbone of civil engineering practices, guiding analyses and designs? Explore concepts like structural mechanics, fluid dynamics, and material science. How do principles from physics and mathematics, such as Newton's laws or Euler's equation, underpin engineering theories? Discuss the role of geotechnical engineering in understanding soil behavior and foundation design. How does environmental engineering integrate ecological principles into infrastructure development? Address the significance of sustainability theories in shaping modern civil engineering practices, including lifecycle assessment and green infrastructure. Overall, delve into how theoretical foundations inform decision$-$making and innovation within the field of civil engineering.