Why are microsporidia so hard to classify?
A. When compared to other eukaryotic organisms, microsporidia are extremely small.
B. They lack nuclei.
C. The intracellular parasitic lifestyle greatly reduces the need for functional organelles.
D. They are very rare.
Answer: C
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Darwin was very interested in the observation that animals on distant and isolated landmasses appeared to be related to animals on the mainlands. However, despite their similar appearance, the animals were indeed not related. Which of the following types of evidence would help Darwin make sense of his observations?
A. biogeographical B. fossil C. anatomical D. biochemical
made of smooth muscle
What will be an ideal response?
Organisms that dominate hydrothermal vents are
a. chemoorganotrophs. b. photolithotrophs. c. phototrophs. d. chemolithotrophs.
What type of joint is found where the humerus joins the shoulder blade?
A. ball and socket B. hinge C. pivot D. saddle E. none of the above