The primitive streak in a bird is the functional equivalent of _____
A) the lip of the blastopore in the frog
B) the archenteron in a frog
C) the notochord in a mammal
D) neural crest cells in a mammal
A
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Do you agree with the practice of using PGD to select for gender or for genetic disabilities present in the parents (for example, deafness and dwarfism)? Why or why not? Should there be legal restrictions on PGD in the US? Why or why not?
What will be an ideal response?
In summer, a(n) ____________________ prevents upper and lower waters from mixing, causing low oxygen content in deeper waters.
Fill in the blank(s) with the appropriate word(s).
Malassezia furfur feed on (keratin/melanin/oil) in the skin.
Fill in the blank(s) with the appropriate word(s).
Metamorphosis in flatfishes and in amphibians is controlled by growth hormone.
Answer the following statement true (T) or false (F)