Based on DNA studies, it seems that all life on Earth ________
A) arose from one of five distinct ancestors that lived about two billion years ago
B) shares a common ancestor
C) requires oxygen to survive
D) belongs to one of just two kingdoms: plants and animals
B
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The specific heat capacity of copper is three times the specific heat capacity of lead. Equal masses of copper and lead are heated from room temperature to the temperature of boiling water. To achieve this, the amount of heat added to the copper is ___________ the amount of heat added to the lead
a. 1/9 b. 1/3 c. equal to d. 3 times e. 9 times
On the vernal equinox the sun is
a. north of the celestial equator. b. south of the celestial equator. c. on the celestial equator and moving north with respect to the equator. d. on the celestial equator and moving south with respect to the equator. e. closest to the north celestial pole.
At the lower left of the Hertzprung—Russell diagram we find
A) supergiant stars B) red giant stars C) white dwarfs D) main sequence stars
The buoyant force acting on an object is equal to the weight of the object
Indicate whether the statement is true or false