Which feature is common to the hagfish, lamprey, cartilaginous fish, and amphibians?
a. Bony appendages
b. Swim bladder or lungs
c. Jaws
d. Backbone
e. Braincase
e
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Members of the class _______ are worm-like mollusks that lack a shell and have aragonite spicules on their skin.
a. Monoplacophora b. Aplacophora c. Scaphopoda d. Polyplacophora
Identify the form of male genital cutting, common among some tribes in central Australia, which involves a slit being made on the lower side of the penis along its entire length and to the depth of the urethra.
A. Supracision B. Supercision C. Subincision D. Superincision
Osteoporosis has long been recognized as a problem for women after menopause, but it is also emerging as a health concern for
A) women and men ages 20-30. B) women ages 16-18. C) men over the age of 65. D) men and younger people in general.
Which of the following is a plausible explanation for the observation that the size of a taxon's geographic range is positively correlated with its chance of survival?
a. A large range protects a taxon against negative events on a global scale. b. A large range increases the chances of synchronized population dynamics. c. Large ranges are always composed of a mosaic of isolated subpopulations. d. Taxa with large ranges tend to have larger population sizes.