Astudent used a yardstick to model elastic rebound. the student bent the
stick without breaking it and then let the stick go. what does the bent stick
represent in the student's model?
a. the rock's deformed shape
b. a seismic wave
c. a fault formed
d. the rock's original shape
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What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons

2. which of the following statements does not accurately describe stem cells? a. embryonic stem cells make up the inner cell mass of a blastocyst. b. with more research, stem cells may be used to repair or replace damaged cells. c. the use of stem cells is without any objections since it can be used in therapies to humans. d. adult stem cells are multipotent and can differentiate into many types of cells.

20 the main source of energy for our planet comes from the