Ancient mathematicians probably used symbols to represent the "empty columns," or zeros, in a number such as
the concept of zero as a number wasn't
developed until the fifth century CE.
How do you complete the text?

Janine studies to improve her math skills

What is the message? how does langston hughes convey the message in this poem?

Which sentence is punctuated correctly?  a. under a microscope; the organisms look a bit like ruffled tennis balls they have armored plates that fit together to make a round shape. b. when the water is disturbed; the organisms respond by glowing this makes swimmers look like floating beams of blue light. c. there is a bay in puerto rico that seems to light up at night; the light comes from tiny organisms in the water. d. the luminescence attracts visitors from around the world people are curious to see; this beautiful otherworldly sight.