A heterozygous female harboring one mutant allele for hemophilia is called a ____ for that trait
Fill in the blank with the appropriate word.
carrier
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Tapeworms
A. have a complicated digestive system. B. do not have a digestive system. C. may be transmitted by eating undercooked meat. D. have a larval stage known as a cercaria. E. do not have a digestive system AND may be transmitted by eating undercooked meat.
Forests serve to
a. hold water. b. control soil erosion. c. control flooding. d. control sediment buildup in lakes, rivers and reservoirs. e. all of these.
Which diseases are caused by viruses?
A. AIDS B. Ebola C. Tetanus D. A & B only E. A, B & C
Evolutionary biologists and geologists recognize the "big five" mass extinctions and are actively studying a potential sixth. Which of these describes that potential sixth mass extinction?
A. The extinction that included the dinosaurs B. The great flood of Noah C. The current extinctions, caused primarily by human activities D. The mass extinction that occurred in the Proterozoic, before animal life E. The end-Carboniferous mass extinction, which affected plants, not animals