The ultimate source of all energy in a
terrestrial ecosystem is
a. the organic matter in all the organisms of
the ecosystem.
b. electrons from water molecules.
c. sunlight.
d. ATP.
e. inorganic mineral ions in the soil.
C
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Tanisha and Tawanda are twins but do not look alike. They are the result of fertilization of
A) one oocyte by two sperm cells. B) two oocytes by one sperm cell. C) two oocytes by two sperm cells. D) one oogonium by one spermatogonium.
Miller and Urey
1.put forth the theory of evolution. 2.created a laboratory simulation of conditions thought to exist on early Earth. 3.discovered they could produce DNA. 4.proved Mendel's work. 5.discovered that they could produce proteins.
The fluid-filled space that helps reduce the friction of a beating heart is called the:a
endocardium. b. pericardial cavity. c. interventricular septum. d. fossa ovalis. e. auricle.
Under the biological species concept, a species is a group of organisms that
A) are physically similar. B) share a recent common ancestor. C) live together in a location and carry out identical ecological roles. D) have the potential to interbreed in nature and produce fertile offspring.