Light consists of units of energy called
A. electrons.
B. calories.
C. neutrons.
D. photons.
E. pigments.
Answer: D
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What can Antarctic ice core samples tell us about atmospheric CO2 levels? Select all that apply
A. Nothingâ€"ice is made of H2O and not CO2. B. CO2 ice core data confirms CO2 measurements taken directly from the atmosphere. C. Ice cores can help scientists estimate atmospheric CO2 levels from centuries ago. D. Ice cores can tell scientists exactly what plants lived on Earth centuries ago.
Another term for the central shaft or main portion of a long bone is the ______
Fill in the blank(s) with correct word
The movement of plates of the Earth's crust is
a. plate tectonics. b. plate dynamics. c. plate mechanics. d. plate kinetics. e. plate motility.
Cytotoxic T cells contain which type of molecules that punch holes in the plasma membranes of potential pathogens?
A. perforin B. antioxidant C. interferon D. steroid E. complement