A challenge to traditional (pre-1860) ideas about species came from embryology, where it was discovered that __________.
A. mutations have a far more dramatic effect on embryos than on adult organisms
B. all animals develop similar embryonic gills
C. the more advanced the animal, the more slowly it develops
D. embryos of dissimilar organisms, such as sharks and humans, resemble each other
D. embryos of dissimilar organisms, such as sharks and humans, resemble each other
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Explain how reproductive isolation is central to the biological species concept
What will be an ideal response?
Which of the following is NOT common to all vertebrates?
a. a cerebellum b. a convoluted cerebrum c. a hindbrain d. a dorsal hollow spinal cord e. a midbrain
During parturtition, mechanical pressure
caused by the movement of the fetus through the uterus causes the release of ___ from the ___.
a. HCG---hypothalamus b. oxytocin---posterior pituitary c. oxytocin---hypothalamus d. HCG---posterior pituitary e. oxytocin---adrenal cortex
The world's first genetically engineered pharmaceutical product was ________
A) humulin B) HGH C) tPA D) EPO