Which of the following statements about the first animals to show cephalization is false?
A. These animals were triploblastic.
B. These animals are placed in the group Lophotrochozoa.
C. These animals were in phylum Platyhelminthes.
D. These animals followed the protostome pattern of embryonic development.
E. These animals had a proboscis
E
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Where are the visual centers located?
A) in the temporal lobes of the cerebral cortex B) in the occipital lobes of the cerebral cortex C) in the lobes of the cerebral cortex D) in the parietal lobes of the cerebral cortex
Which of the following is characteristic of mosaic development?
a. The cells of the adult are very different from each other. b. The fate of adult cells is predetermined in embryonic founder cells. c. Adult cells are richly interspersed with proteins. d. Embryonic cells have a wide range of possible developmental patterns. e. Embryos have a wide range of morphologies, but all look identical as adults.
Your first candidate for a regression to identify the effect of X1 on Y is: Yi = ?0 + ?1X1i + ?2X2i + Ui, where X2 is a control variable. Suppose a member of your consulting team suggests to you that another variable Ri should be a control that is also included in your regression, in order for you not to be worried about the endogeneity problem. What condition could you credibly test using data on Y, X1, X2, and R which could justify the inclusion of Ri as a control in your regression?
A. spcorr(Ri, Yi (Xi1, Xi2)) ? 0 B. Ri is exogenous. C. Ri has a strong correlation with X2. D. Ri has no effect per se on Yi.
What do smooth, cardiac, and skeletal muscle all have in common?
A. They all interlock at intercalated disks. B. The cells of these muscles are all called muscle fibers. C. They are all striated. D. They are all uninucleated. E. They are all found in the walls of blood vessels.