The fetus is extremely vulnerable to environmental factors that can cause birth defects during the
A. second trimester.
B. third trimester.
C. first trimester.
D. 12th through 24th week of pregnancy
Ans: C. first trimester.
Biology & Microbiology
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Which class of gnathostomes is extinct?
a. Sarcopterygii b. Actinoptertygii c. Acanthodii d. Holocephali
Biology & Microbiology
The point at which this neuron will be able to
generate another action potential is indicated by a. A. b. B. c. C. d. D. e. E.
Biology & Microbiology
Which of the following represents the lowest level of chromatin packaging?
a. 10 nm fiber b. chromonema fiber c. nucleosome d. 30 nm fiber e. interphase chromatid
Biology & Microbiology
These keystone bones of the face contact all other facial bones except the mandible.
What will be an ideal response?
Biology & Microbiology