A circulatory system in which the heart pumps blood to tissues throughout the body cavity is
A. a closed circulatory system.
B. a gastrovascular cavity.
C. an incomplete circulatory system.
D. a complete circulatory system.
E. an open circulatory system.
Ans: E. an open circulatory system.
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____ is the process where new genes evolve from duplicates of old ones
Fill in the blank with the appropriate word.
Branches of a bronchus are known as ____
a. larynx b. bronchi c. bronchioles d. trachea e. pharynx
Genes for different traits located on the same chromosome in close proximity are called ________ genes
Fill in the blank(s) with correct word
Amino acids include a side group as well as ________
A) a central carbon, a hydrogen atom, an amino group, and a carboxyl group B) a central carbon, a hydrogen atom, a hydroxyl group, and a carbonyl group C) a central nitrogen, a carbon atom, a hydroxyl group, and a carbonyl group D) a central nitrogen, a carbon atom, an amino group, and a carbonyl group