Alife-form in the precambrian time was
a. cyanobacteria
c. reptiles
b. humans
d. dinosaurs

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.

Which arrow is closest to laguna madra bay? a. 1 b. 2 c. 3 d. 4

What is the hottest planet in the solar system?