Which of the following occurs during gastrulation?

a. formation of the gray crescent region
b. formation of ectoderm, mesoderm, and endoderm
c. closure of the archenteron
d. formation of the blastocoel
e. radial cleavage takes place


b

Biology & Microbiology

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Why are endemic species inherently so vulnerable?

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The sporophyte generation 

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How does the plasma membrane of bacteria and archaea differ?

A) Archaea build only lipid monolayers. B) Bacteria have phospholipids built from branched fatty acids. C) Archaea have phospholipids built from branched fatty acids. D) Bacteria build only lipid monolayers. E) Archaea have phospholipids built from linear fatty acids.

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