Which organ system acts upon substances contained in the alimentary canal?

A) circulatory system
B) digestive system
C) integumentary system
D) excretory system


B

Biology & Microbiology

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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

Biology & Microbiology

Tertiary bronchi lead to bronchioles

a. true b. false

Biology & Microbiology

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.

Biology & Microbiology

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).

Biology & Microbiology