There are 4 pulmonary veins that enter the left atrium

a. true
b. false


Answer: a. true

Biology & Microbiology

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A person peddling a bicycle is an example of which of the following?

a. potential energy b. chemical energy c. kinetic energy d. light energy

Biology & Microbiology

Which of the following represents the correct order of vertebrate gastrointestinal tract layers, going from outside the tract to inside the tract? 

A. the serosa, submucosa, and the lumen B. the submucosa, the mucosa, the lumen, the plexuses, and the serosa C. the serosa, the mucosa, and the submucosa D. the serosa, submucosa, and the mucosa E. the mucosa, the plexuses, and the serosa

Biology & Microbiology

Which of the following does not belong?

a. phospholipids b. polysaccharides c. unsaturated fats d. steroids e. saturated fats

Biology & Microbiology

Two elements within the same group:

a. occupy the same column on the periodic table of elements. b. occupy the same row on the periodic table of elements. c. occupy the same column on the periodic table and have the same number of electrons in their outermost shell. d. have different numbers of electrons in their outermost shell. e. have the same number of electrons in their outermost shell.

Biology & Microbiology