Radioactive dating techniques have demonstrated that Earth was formed approximately ________ years ago
A) 10 billion
B) 46 million
C) 4.6 million
D) 4.6 billion
D
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A zygote is:
A. haploid. B. diploid. C. polyploid. D. monoploid.
Which statement is TRUE?
A. Natural selection works on variation already present in a population. B. Individual organisms evolve structures that they need. C. Natural selection works on non-heritable traits. D. Individuals evolve through natural selection.
Pyramids of numbers are of limited usefulness because they:a
do not indicate the biomass of the organisms at a given time. b. do not indicate the gross primary productivity of each species. c. do not include energy flow through the ecosystem. d. include three trophic levels. e. None of the answer choices is correct.
The cell's metabolic reactions involve the participation of ________ that lower the activation energy needed for the initiation of a reaction.
A. coenzymes B. enzymes C. cofactors D. ATP E. vitamins