Which of the following can be present in a vaccine?
a. live pathogen
b. weakened B-cells
c. unmodified antigen from a pathogen
d. killed pathogen or weakened pathogen
e. killed pathogen or weakened pathogen or unmodified antigen from a pathogen
D
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Examine the flux diagrams in Figure 25.6 to address the following questions. True or false. CO2 is considered a greenhouse gas because it traps heat emitted from Earth's surface in the atmosphere, affecting global temperatures
Indicate whether the statement is true or false.
The appearance of __________ marks the onset of
gastrulation in humans. a. a notochord b. the primitive streak c. mesoderm d. neural folds e. somites
Which of the following is a single-layered, hollow ball of 16 cells?
a. cleavage b. morula c. gastrula d. zygote e. blastula
Which of the following is most likely to be aquatic?
A) suspension feeder B) mass feeder C) deposit feeder D) fluid feeder