a. an electron must be transferred from one element to another. NO - that's ionic
b. the electrons in the bond must be shared equally. No, that's covalent NON polar
c. one atom's pull on the electron/s must be greater than the other's pull. YES
d. both atoms in the molecule must be isotopes. No

2. All of the following are Earth's natural power sources EXCEPT..

a. radiation from radioisotopes
b. geothermal energy
c. solar radiation
d. kinetic energy in bouncing balls ding ding ding

3. Which one of the following is NOT characteristic of hydrothermal vents?

a. Entire communities thrive in high temperature and pressure.
b. Abundant sunlight makes possible photosynthesis. NO NO NO in the dark
c. Giant tubworms survive because of bacteria that produce food from hydrogen sulfide
d. Spouts of hot, mineral rich water come from the ocean floor

4. Chlorophyll is a light-absorbing pigment which makes possible the ___ of photosynthesis during which ___ is split.

a. Calvin cycle, chloroplasts
b. chemosynthetic reactions, hydrogen sulfide
c. light reaction, water Here we are
d. krebs cycle, sugar

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