Directly above the Earth's equator lies the ________ in the sky.
A. ecliptic
B. north celestial pole
C. south celestial pole
D. celestial equator
Answer: D
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The IUCN's Red List is ________
A) an updated list of species facing unusually high risk of extinction B) a list of unidentified species C) a list of ecologically harmful invasive species D) a scorecard of international failures at conservation E) an identification list of known species
When did over 96% of marine and 70% of land species on Earth become extinct?
A. K-T boundary B. T-C boundary C. P-T boundary
Photosynthesis converts
A) light energy, carbon dioxide, and water into carbohydrates and oxygen. B) light energy, oxygen, and carbohydrates into carbon dioxide and water. C) heat energy, carbon dioxide, and water into carbohydrates and oxygen. D) heat energy, oxygen, and carbohydrates into carbon dioxide and water.
A scientific theory is a tentative or untested explanation that is proposed to explain scientific observations
Indicate whether the statement is true or false