Can you help me with these 4 questions please?

Which the following is a common trait in a four year college

The ancestors of horses possessed feet with five digits. over time, with the development of grasslands, the digits fused and formed hooves. what evolutionary advantage did this transformation serve? a. it allowed them to climb rocky surfaces with ease. b. it allowed them to graze better. c. it enabled them to run faster from predators. d. it let them see clearly through the grasslands. e. it made them taller.

To safely control the traffic flow and protect workers near public roadways and moving construction equipment use you could use