Which tissues are found in a sample of skin?
What will be an ideal response?
Skin is a complex organ that contains epithelium, smooth muscle, nerve tissue, and several types of connective tissues.
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The majority of carbon dioxide carried in the blood is found in which form?
a. dissolved in plasma b. bound to hemoglobin c. converted to bicarbonate d. converted to oxygen e. bound to the respiratory membrane
What is one reason why the classification of protists is difficult?
a) some protists are unicellular while other protists are multicellular b) all of the other answer choices c) protists more closely resemble members of other eukaryotic kingdoms than they do other protists d) protists may be funguslike, plantlike, or animal-like, but they do not have characteristics of more than one of these groups
Hemopoiesis begins early in embryonic development in the
A) bone marrow. B) spleen. C) lymphatic organs. D) yolk sac.
The collars on the cells of choanoflagellates have the function of:
A. protecting the flagellum B. attaching to the substrate C. storing waste materials of the cell D. filtering bacterial food from the water E. directing currents away from the flagellum