Classify each of the following as an atom, a compound, or a molecule:

the smallest possible "piece" of gold (Au)

the smallest possible "piece" of quartz (SiO2)

water (H2O)

what a molecule of CO2 is made of

hydrogen gas (H2)

The most apparent difference between modern humans and Australopithecus africanus is that Australopithecus africanus a. did not stand upright b. did not walk upright c. did not have free use of his hands (they were used in moving) d.

A mineral must be which of the following? select all that apply A solid B organic C crystalline D homogenous

the ozone layer absorbs energy and protects life on earth. some chemicals, called CFCs, have damaged the ozone layer. which of these explain what happens when the ozone layer is damaged?

What happens to cells where the phosphate is out of control? What could be the result of consequences?

4. The relatively clear liquid medium which carries the other cells of blood is called: a) lipid b) antibody c) plasma

Which of the following is correctly paired with its function? a) sensory somatic nervous system-controls skeletal muscles b) autonomic nervous system - creates voluntary response to stimuli c) parasympathetic nervous system - controls body response

Which of the following would be true of a plant heterozygous for a single gene controlling flower color? (Assume complete dominance).

How do the population in an ecosystem depend on each other

Which statement describes the formation of our sun? A disk formed of long trails of stars coiled into a spiral. It formed an elliptical flattened disk. Heat and gases contracted within a nebula. Gravity pushed stars away from a center core.

Identify which questions can be answered through science and which cannot.