As part of a research project, a graduate student creates an artificial environment in a sealed container. She sterilizes the soil and adds plants, snails, shrews, and a snake. After adding a small artificial pond, she seals the container
During the first several weeks, the plants are thriving and the animals are doing well. However, piles of dropping are beginning to accumulate, and the entire floor of the container becomes covered with a layer of plant debris several inches thick. One probable cause for the problems is that the graduate student didn't
A) include any autotrophs.
B) include any carnivores.
C) add any decomposers.
D) include any herbivores.
E) put in enough plants.
C
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The type of epithelial tissue that forms a single layer of elongated cells is
A. stratified cuboidal. B. simple squamous. C. stratified squamous. D. stratified columnar. E. simple columnar.
Over 90% of all cells in the nervous system are ____
a. motor neurons b. sensory neurons c. integrator neurons d. interneurons e. glial cells
The efferent arterioles transport blood directly into the:a
afferent arterioles. b. Bowman's capsule. c. glomerulus. d. peritubular capillaries. e. renal artery
Which microscope is extremely valuable for examining different layers of specimens and often involves the use of shadow casting?
a) Transmission electron microscope b) Scanning electron microscope c) Phase-contrast microscope d) Darkfield microscope