4. As a group, acoelomates are characterized by (A) deuterostome development. (B) the absence of a brain. (C) a coelom that is not completely lined with mesoderm. (D) a solid body without a cavity surrounding internal organs. (E) the absence of mesoderm.

11. Which of the following statements is correct? (A) Speciation occurs when mutations generate observable differences. (B) A species is composed of organisms located in the same habitat. (C) Speciation occurs when natural selection pressures reach their maximum. (D) A species is composed of a group of reproductive females. (E) Speciation occurs after populations become reproductively isolated and diverge.

4. As a group, acoelomates are characterized by
(A) deuterostome development.
(B) the absence of a brain.
(C) a coelom that is not completely lined with mesoderm.
(D) a solid body without a cavity surrounding internal organs.
(E) the absence of mesoderm.

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