Which body system develops first in a human embryo?
A. nervous
B. excretory
C. reproductive
D. respiratory
E. circulatory
Answer: A
Biology & Microbiology
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Many species of angiosperms are self-incompatible due to the presence of the ____ -gene
Fill in the blank with the appropriate word.
Biology & Microbiology
Multiple operons may be controlled by ________ or ________.
Fill in the blank(s) with the appropriate word(s).
Biology & Microbiology
Demographic studies include all of the following except what?
A. age structure B. growth rates C. mortality and survivorship curves D. sex ratio E. measurements of interspecific competition
Biology & Microbiology
All gills
a. consist of overlapping rows of filaments. b. are external. c. are paired. d. are associated with a blood transport system. e. fit all of these descriptions.
Biology & Microbiology