Which equation shows that mass is conserved in the chemical reaction? * a. N2 +2H2 → 3NH3
b. N2 +H2 → NH3
c. 3N2 +H2 → 2NH3
d. N2 +3H2 → 2NH3

What term is applied to a scientist who studies ancient life, including animal and plant fossils a. anthropologist b. dendroclimatologist c. geophysicist d. paleontologist

The gulf stream is a warm water current that flows away from the equator to northern europe. witch of these does it cause. a. crashes of warm and cool water in the ocean b.colder climates near the equator c.large waves on the cost of europe d.warm climates in northern europe

Which of these is a density dependent factor? a. epidemic b. earthquake c. drought d. hurricane