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.

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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

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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