A difficulty in understanding the Colombian exchange is that: A. It is unknown which things we first found in which areas. B. Things once unknown now seem like they have always been a part of many cultures C. It is not possible to find out which things were exchanged on purpose or by accident D. Things once I know have different names in different cultures

the government paid religious orders to provide basic education to native american children on reservations. in the late 19th and early 20th centuries, the bureau of indian affairs (bia) founded additional boarding schools based on the assimilation model of the off-reservation carlisle indian industrial school.

the perimeter of a triangle is 69 cm. side a is 5 cm shorter than side b. side c is twice as long as side a. find the length of each side. i need to know how to do it in 2 equations.  

equations:

a = b-5

c = 2a

a + b + c = 69

is there answer chooses?

the answer is a. physical map