Which of the following protists are capable of forming cysts?
A) E. histolytica
B) A. proteus
C) T. gambiense
D) T. vaginalis
A) E. histolytica
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Several infections of the cardiovascular system can be identified by inspecting a stained blood smear in the microscope. For the following infections, identify the microscope observation that does not fit the disease.
A. Chagas disease; protozoan visible among blood cells B. Malaria; ring trophozoites visible inside red blood cells C. Epstein-Barr virus; virus visible inside red blood cells D. Babesiosis; protozoan visible inside red blood cells
Contraction of the fibers labeled A in the accompanying figure results in:
a. elongation of the body.
b. elongation of the tentacles.
c. elongation of the gastrovascular cavity.
d. shortening of the body.
e. expansion of the pedal disk.
In many parts of the Amazon Basin, farmers have cut down the tropical rain-forest trees and planted crops. However, the farmers often abandon these croplands after a few years and move on. What are some possible reasons for this?
What will be an ideal response?
An oligotrophic ecosystem would be most likely to exist in a/an ________
a) Ocean b) High mountain lake c) Tropical pond d) Polluted river