The outer layer of the molluscan shell is called the ____ layer
a. foot
b. collagen
c. nacreous
d. prismatic
e. periostracum
E
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If a molecule of carbon dioxide released into the blood in your left toe is exhaled from your nose, it must pass through all of the following EXCEPT _____
A) the pulmonary vein B) an alveolus C) the trachea D) the right atrium E) the right ventricle
Which of the following is a possible outcome of activation of the complement system?
A. inflammation B. enhanced phagocytosis C. bacterial cell lysis D. All of the answer options are correct.
Methanogens can live only in ________ environments.
A. anaerobic B. microaerophilic C. aerobic D. All of the choices are correct.
Populations can be divided into three ecologically important age classes: prereproductive, reproductive, and ________
Fill in the blank(s) with correct word