The accumulation of free oxygen in the
atmosphere
a. was a result of the accumulation of a byproduct
of a type of photosynthesis.
b. prevented the further spontaneous
generation of life.
c. provided the opportunity to extract more
energy through aerobic respiration.
d. did not occur immediately after the earth
was formed.
e. did all of these.
E
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Chemical reactions involving ________ have been proposed as energy-yielding reactions for primitive organisms
A) Fe, O2, and H2 B) S, O2, and H2 C) S, and O2 D) S, and H2
Pioneer plant species are usually characterized
by a. small size. b. high dispersal rates. c. slow maturation. d. high dispersal rates and high numbers of offspring e. small size, efficient dispersal mechanisms, and slow maturation.
All of the following are adaptations of diving marine mammals for extended submersion times except:a
breathing in an extra supply of oxygen before a dive. b. high concentrations of myoglobin. c. greater blood volume per unit mass, compared to nondiving mammals. d. a larger than typical spleen. e. the collapse of lungs at fairly shallow depths.
The frequency of a sound wave determines the ________ of the sound you hear
A) loudness B) tone C) amplitude D) pitch