What two of the three challenges listed prevented Europeans from penetrating Africa until the late 19th century?

Cigarette manufacturers purposefully add to cigarettes in order to give them a particular flavor. a. cocaine b. carcinogens c. cigarette ashes d. a and b

Question 4(multiple choice worth 10 points elise chooses to watch a movie with her friends instead of studying for her english test. this is an example of wasting talent getting distracted allowing others to set goals

Bytes are commonly used to identify the size of digital information. how many bits are in a byte? 1 2 8 10