Which is the most reliable source for a presentation about the history of Washington, DC’s Smithsonian museums?

Try this wesite:https://www.si.edu/museums/american-history-museum

Explanation:

I use this website personally and its really good.      

thinking it would be d not too sure but i think it's right

the "power" of a lens is its resolution power, or its ability to distinguish between to closely located points. with the low power lens, it is likely you will see the rough form of the hay and maybe some movement of dots around the hay. however, when observed with the high power lens, the detailed features of the hay become visible and the microbes being grown are more clearly visible.

i hope this you