Competition between species is called ________ competition.
A. interference
B. interspecific
C. intraspecific
D. exploitative
E. fundamental
Answer: B
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Analyses of molecular sequences for study of evolutionary relationships are constrained by ____
a. the fact that every base in a nucleic acid serves as a separate, independent character for analysis b. the presence of many genes that have been conserved by evolution c. the limited number of nucleotide characters, making it difficult to determine whether genetic similarities between species are homoplastic or homologous d. the usefulness of genes for studying only closely related species that have minor morphological differences e. nucleic acids that are not directly affected by the developmental or environmental factors that cause nongenetic morphological variations
The Cretaceous is the period in which
a. mammals diversified and flourished. b. life appeared on this planet. c. the first animals with shells and skeletons appeared. d. the dinosaurs reached their peak and then became extinct. e. the first human-like apes appeared.
Among the following substances contaminating Aberdeen Proving Ground in Maryland, which is an organic compound
that damages the nervous system, liver, and lungs?
a. lead b. arsenic c. dimethyl chloride d. trichloroethylene e. mercury
Some chytrids parasitize protists.
Answer the following statement true (T) or false (F)