What do you think is a challenge for cliff swallows living in this new environment that would explain an increase in the number of swallow roadkill seen in the 1970s, after the highway was completed?

i think the answer would be d

he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

i hope this : )