__________ species are likely to become endangered
in the future. Fill in the blank(s) with the appropriate word(s).
Answer: Threatened
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Tetanus antitoxin can cross the placenta
Indicate whether this statement is TRUE or FALSE.
Which of the following statements about the placenta is false? a. The mother's body disposes of wastes for both mother and child
b. The placenta begins forming early in pregnancy. c. Maternal and fetal blood mix in the placenta. d. Embryonic blood vessels exchange substances with maternal blood.
When two frog species, Rana pippins and Rana sylvatica, mate, the offspring die early in embryonic development. This is an example of ___________.
A. Hybrid sterility B. Reduced hybrid fertility C. Mechanical isolation D. Reduced hybrid viability
Science as a way of seeking principles of order differs from art, religion, and philosophy in that:
A) science limits its search to the natural world of the physical universe. B) science deals exclusively with known facts. C) all scientific knowledge is gained by experimentation. D) all scientists wear white lab coats. E) there is no room for intuition or guessing