Which describes the death of an interspecific embryo that failed to develop?
a. hybrid sterility
b. hybrid breakdown
c. hybrid inviability
d. ecological barriers
e. prezygotic isolation
c
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The basic reproduction number of a pathogen
A) can vary during an epidemic based on infection control measures. B) can be determined experimentally in the lab. C) is usually high for pathogens that are transmitted through direct contact. D) can be determined experimentally and is usually high for pathogens that are transmitted through direct contact.
European explorers sailing across the Pacific leave several pairs of pigs on a remote island with the intention of visiting again in future years to harvest fresh meat. This would most resemble a case of artificially induced allopatric speciation through:
A. vicariance. B. dispersal.
Which of the following molecules help maintain cell-cell adhesions in plants?
A. cadherins B. pectins C. integrins D. cellulose
Which of the following is a product of the Calvin cycle?
a. carbon dioxide b. glucose c. oxygen d. water