Why do you think it would be so challenging for the U. S. to switch over to using the Metric System? What are some issues that we would face?

The expense of the U.S. changing over to the metric system translates into changed measurements on all packaged products, starting with food. Also some issues are  that The change would also impact housing and lot sizes, the measurement of temperatures with the new use of Celsius, and the change of mileage and speed signs.

Explanation:

Hope this helps :)

a. suckling by young

b. hypothalamus

c. dopamine

d. trh

e. anterior pituitary

f. mammary glands

g. milk production