The outer-to-inner sequence of tissue layers in a post-gastrulation vertebrate embryo is _____
A) endoderm ? ectoderm ? mesoderm
B) mesoderm ? endoderm ? ectoderm
C) ectoderm ? mesoderm ? endoderm
D) ectoderm ? endoderm ? mesoderm
C
Biology & Microbiology
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The movement of substances to regions of lower concentration is called
A. active transport. B. diffusion. C. pinocytosis. D. pumping. E. exocytosis.
Biology & Microbiology
Which of the following is an inorganic charged
particle found in soil?
a. humus b. clay c. sand d. silt e. all of these are charged inorganic soil particles
Biology & Microbiology
Which form of transmission is typically characterized by low virulence?
A) horizontal transmission B) vertical transmission C) indirect transmission D) direct transmission
Biology & Microbiology
The virus most closely related to HIV infects monkeys
Indicate whether the statement is true or false
Biology & Microbiology