which one of the date ranges shown below are the days and nights about the same length in the northern hemisphere?

a. around march 20 and december 21

b. around june 21 and december 21

c. around march 21 and september 22

d. around june 21 and september 22

Idon’t know the answer and i’ve been stuck on it for a while now skskskskks

Asolution containing hci would likely have

Which of the following must be true for a fossil organism to be useful as an index fossil? a. the fossil organism must be widespread geographically. b. the fossil organism must be abundant. c. the fossil organism must be limited to a short span of geologic time. d. all of the above.