Which of the following is involved in breathing and protects the heart and lungs?

a) pectoral girdle
b) thoracic cage
c) vertebral column
d) skull


Answer: b) thoracic cage

Biology & Microbiology

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Which represents the highest degree of

certainty? a. hypothesis b. deduction c. assumption d. theory e. prediction

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Production of a neurotoxin that prevents acetylcholine release from motor neurons at neuromuscular junctions is a characteristic of ________.

A. Clostridium difficile B. Clostridium botulinum C. Clostridium perfringens D. Clostridium tetani

Biology & Microbiology

According to the pressure-flow hypothesis:a

water moves from an area of positive water potential to an area of negative water potential. b. the evaporative pull of transpiration produces tension at the top of the plant. c. the flow of sugar is driven by a hydrostatic pressure gradient produced by water entering the phloem. d. pressure is created by the movement of water into the roots from the soil. e. the column of water pulled up through the plant is unbroken due to cohesive and adhesive properties.

Biology & Microbiology

Giant squids are classified as

A) mollusks. B) chordates. C) platyhelminthes. D) echinoderms. E) arthropods.

Biology & Microbiology