Which will exhibit the most shared maternal effects (uterine environment, etc.), identical or fraternal twins?
What will be an ideal response?
identical
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The blood vessels of the umbilical cord are formed by which extraembryonic membrane?
a. yolk sac b. chorion c. allantois d. amnion e. placenta
The nucleotide that serves as an energy carrier in cells is _____
a. trans fat b. ATP c. DNA d. glycogen e. RNA
Which of the following leukocytes kills its target cells, such as cancer cells or virus-infected cells, by releasing chemicals that break down the target cell membrane?
A) natural killer cells B) B lymphocytes C) basophils D) T lymphocytes E) macrophages
The three phylogenetic trees shown here all contain the same members and all have a common ancestor, but are divided up in three different ways. Which tree has members circled that are of more than one evolutionary line and does not include the most recent common ancestor of the included lineages? What type of group is this? 
A. Tree 2; polyphyletic. B. Tree 1; monophyletic. C. Tree 3; polyphyletic. D. Tree 2; paraphyletic. E. Tree 3; monophyletic.