Most of the mass of an atom is located in its:a
protons.
b. electrons.
c. outer orbits.
d. nucleus.
e. ions.
D
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What is a pheromone?
A. A new form of chemical insecticide waiting approval by the EPA B. A strong herbicide C. A species-specific chemical sex attractant D. A chemical that travels in the bloodstream and controls an organism's growth and development E. A safe, natural pesticide
In the early 19th century, the owners of Hawaii 'an sugar plantations faced which of the major drawbacks?
A) The lack of water and shortage of labor. B) The lack of arable land and the lack of water. C) The shortage of labor and the lack of useable land. D) Hostility from native groups and the lack of water.
Which Milankovitch cycle lasts about 100,000 years?
A. precession B. tilt angle variation C. orbital eccentricity
Flying reptiles such as the Archaeopteryx led to the evolution of ________
A) dinosaurs B) birds C) mammals D) insects