Recognizing that a person with black hair and a tightly woven hair texture could be of african, cuban, or puerto rican descent is recognizing that some groups select one: a. share some biological features but are ethnically different b. share cultural differences but are ethnically alike c. can be generalized based on race d. share racial differences but are ethnically alike

Recognizing that a person with black hair and a tightly woven hair texture could be of African, Cuban, or Puerto Rican descent is recognizing that some groups share some biological features but are ethnically different (a).

To reach this conclusion, you need to be able to understand the keywords "biological features" and "ethnicity."

answer: the time zones used to be whatever the local authority wanted them to be. one town might have 6am whenever the sun came up and another town had 6am 10 minutes later.  

the trains had a hard time when their orders said to be at a certain point at 6am.  

6am, but who's 6am.  

the railroads got together and set the time zones more or less along the longitude lines across the country.

explanation: