17. According to the Mohs Hardness Scale, what's the approximate hardness of topaz?

A. 8

B. 10

C. 9

D. 7

Earthworms contain all of the following organisms except a A. Digestive System B. Skeletal system C. Circulatory system D. Nervous system

Which of the following statements about extinction is true? Choose one: A. Recent species are disappearing so slowly that researchers suggest our present time is another mass extinction. B.

Which of the following is the most common cause of neonatal meningitis? Haemophilus influenzae b Streptococcus agalactiae Neisseria meningitidis Streptococcus pneumoniae

What are some ways that local emergency operations centers (eocs) can improve coordination with partners prior to a hazardous event? choose all that apply?

Waves of force that travel through Earth as a result of an earthquake are called compression waves tectonic waves seismic waves boundary waves

Why does photosynthesis require water? a. because water provides oxygen atoms. b. because water provides electrons. c. because water accepts electrons. d. because water acts as a catalyst.

An education guess or rational explanation about a specific phenomenon

What are the technical name for red blood cells white blood cells and platelets?

What are the resources of the ocean

Which organism actively hunts other