Connective tissue is different from other major tissue types in that it
A) is made of cells.
B) has cells that are sparsely scattered through a nonliving matrix.
C) covers the surface of the body.
D) conducts electrical impulses throughout the body.
Answer: B
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Which of the following is the best description of a protozoan?
A. a heterotrophic protist B. a chemotrophic protist C. a heterotrophic prokaryote D. a chemotrophic prokaryote E. a photosynthetic protist
Oxygen-16 is abundant and has 8 protons and 8 neutrons. Oxygen-18 has two extra neutrons. These two forms are:
A. oxygen isotopes. B. oxygen ions. C. oxygen isomers. D. oxygen dimers.
All animals are ____.
A. multicellular, heterotrophic, and motile B. multicellular, heterotrophic, and have walled cells C. unicellular, autotrophic, and motile D. multicellular, autotrophic, and reproduce sexually E. unicellular, autotrophic, and reproduce asexually
If an organism is missing the outer layer of skin upon birth, which of the following might be the cause?
A) improper development of the mesoderm B) improper development of the ectoderm C) improper development of the endoderm D) improper development of the endoderm and the mesoderm