In your biology lab, you use a stereoscopic microscope to observe a living animal that uses only one opening to both take in its food and eject its waste products. What is the body arrangement of this animal?
A. gastrovascular cavity
B. incomplete digestive tract
C. complete digestive tract
D. complete digestive tract and a gastrovascular cavity
E. incomplete digestive tract and a gastrovascular cavity
E. incomplete digestive tract and a gastrovascular cavity
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Which of the following relationships best describes the partial pressure of oxygen (pO2) in the lung, red blood cells, and blood plasma?
A. pO2 lung < pO2 blood plasma < pO2 red blood cell B. pO2 blood plasma < pO2 lung < pO2 red blood cell C. pO2 red blood cell < pO2 lung < pO2 blood plasma D. pO2 red blood cell < pO2 blood plasma < pO2 lung
Surface tension of water is due to
a. ionic bonding. b. ionization of water. c. the ability of water to act as a solvent. d. hydrogen bonding. e. water molecules repelling each other.
When collagen is hydrolyzed it forms gelatin, the main ingredient of a jiggly dessert adored by children. What parts of a cow provide a rich source of collagen?
A. Brain B. Glandular organs C. Skin, tendons, and cartilage D. Heart and other muscles
Which example of an evolutionary adaptation decreases herbivory?
A) Plants of the milkweed family produce a toxin that Monarch butterflies can store in their bodies. B) Corn plants attacked by herbivores release an airborne chemical that turns on defensive genes in nearby corn plants. C) Caterpillars that feed on plants tend to be green. D) Damaged, partially eaten leaves can seal off the damaged area by hardening cell walls.