The process by which parents produce offspring is called ____
a. feeding
b. homeostasis
c. compensation
d. artificial selection
e. reproduction
e
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The Northern leopard frog (Rana pipiens) and Southern leopard frog (Rana utricularia) are morphologically similar, but they do not mate. They sound very different when calling for a mate. Which mechanism may explain why these frogs are listed as separate species?
A. the inability to interbreed because of morphological differences. B. the difference in bone structure and skin color of the organisms. C. DNA sequences of particular genes. D. the habitat of the organisms. E. both the DNA sequences of particular genes and the inability to produce viable offspring.
During an asthma attack, allergens trigger the release of histamine, which causes severe constriction of the __________________.
A. pleural cavities B. trachea C. rib cage D. bronchi E. larynx
Sustainable agriculture depends on planting large tracts of high-profit crops
Indicate whether the statement is true or false
Traditional animal phylogenetic trees and the most recent molecular phylogenetic trees have many similarities. Which is a feature of the recent trees that was not present in the traditional phylogeny?
A) the placement of Echinodermata and Chordata together in a clade of deuterostomes B) the status of sponges as the first group to diverge from the other animals C) the grouping of nematodes and arthropods into a clade called the Ecdysozoa D) the grouping of all bilaterally symmetric animals within a single clade