Probably 90 j but im not sure I haven’t done any work like this in a while
Answer:
hertz (Hz)
The number of periods or cycles per second is called frequency. The SI unit for frequency is the hertz (Hz).
Answer:
For the first one, its B) cities B and C
I'm not so sure, but I hope this helps.
Answer:
The state of a certain type of land or a biome.