The chorion is the extraembryonic membrane closest to the embryo proper
____________________ Indicate whether the statement is true or false.
F, amnion
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A researcher has been studying lichens in his hometown. Since he began his study, he has noticed several lichens dying in the vicinity of a new factory. What is most likely causing the decrease in lichen populations?
A. the diversion of water sources to the factory (i.e., lichens are drying out) B. an increase in air temperature, the result of CO2 emissions from the factory C. the blocking of sun by the factory (i.e., the lichens aren't getting enough sunlight) D. an increase in industrial pollutants in the area
The advantage of having a double circulation is that the ventricles may act as two pumps with an ability to deliver blood at different pressures. Which animals exhibit a "double circulation" and four-chambered hearts? Check all that apply.
_____ humans _____ dogs _____ crocodiles _____ frogs _____ birds _____ turtles
Blanks “A” and “B” should be labeled respectively
a. does not drink; loss b. does not drink; gain c. drinks; loss d. drinks; gain e. none of these
Adaptive radiation is best described as the
A. existence of groups of distantly related species recently evolved from a common ancestor. B. existence of groups of closely related species recently evolved from different ancestors through hybridization. C. existence of individuals of closely related species that originated in different areas within diverse habitats but that have rejoined as a single species. D. existence of groups of closely related species recently evolved from a common ancestor.