A student has a rectangular block. It is 4 cm wide, 6 cm tall, and 15 cm long. It has a mass of 400 g. What is the density of the rectangular ball? (Hint: There is an extra step involved in this question)

Which of the following insects is a decomposer? a. mosquito. b. caterpillar. c. beetle. d. none of the above.

What evidence does the writer give to support his argument about coral reefs? a) he speaks of the activities of coral polyps. b) he describes the composition of the great barrier reef. c) he emphasizes the ways in which coral reefs are fragile. d) he points out the ways that scientists do research on the reefs.

Can someone me with this plz? ! i'm putting 20 points on it!