The first forms of life on earth were
a. plants
b. microorganisms
c. birds
d. dinosaurs 5. a suggested and testable explanation for an event is called a
a. hypothesis
b. variab

The diagram shows the layers of earth. convection currents in which region influence the movement of tectonic plates

A60-tooth gear is connected to a 72-tooth gear. if the smaller gear turns 12 times, how many turns does the larger gear make?

Onsider the paragraph above. what is one chemical property of water? a) water is a polar molecule. b) water is the universal solvent. c) water reacts with group 1 metals. d) water has a high specific heat capacity.