Which organ system acts upon substances contained in the alimentary canal?
A) circulatory system
B) digestive system
C) integumentary system
D) excretory system
B
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Which of the following is considered the key innovation that started chordates along the evolutionary path that led to vertebrates?
A. a flexible rod to which muscles are attached, which allowed lateral movement of the back B. an internal endoskeleton C. a skin covering the entire body to prevent desiccation D. a hard shell encasing the body E. amniotic egg
Tertiary bronchi lead to bronchioles
a. true b. false
New species that arise in the same physical area as its parent species is called sympatric speciation.
Indicate whether the statement is true or false.
Most CO2 reacts with water inside red blood cells to form bicarbonate due to the enzymatic activity of __________.
Fill in the blank(s) with the appropriate word(s).