The most obvious characteristic of annelids is the repeated segments that make up their bodies. They also have a complete digestive system, and a coelom. Which of the following is true of an annelid?
A. They have cephalization and an open circulatory system.
B. Their gut is separated from their body wall.
C. They have cephalization.
D. Their gut is separated from their body wall and they have cephalization.
E. They have an open circulatory system.
D. Their gut is separated from their body wall and they have cephalization.
You might also like to view...
The most frequently encountered category of cancer is
A) carcinoma. B) sarcoma. C) lymphoma. D) leukemia. E) both choices C and D
A liger is an offspring produced from a mating between a male lion and a female tiger. Male ligers cannot produce offspring. This is an example of
A. a prezygotic mechanism. B. hybrid inviability. C. hybrid sterility. D. hybrid breakdown. E. a prezygotic mechanism and hybrid sterility are correct.
Which of the following statements is false?
a. The information that travels along the neural membrane is little more than a transient change in the membrane potential. b. A neuron is never really at rest but must expend energy to keep the membrane potential constant even when no impulse is being transmitted. c. During the short time an action potential occurs, the cytoplasmic side of the membrane becomes positive with respect to the outside. d. Only nerve cells can exhibit depolarization events. e. Action potentials are not directly transferred from neuron to neuron.
Slugs produce mucus all over their bodies that helps keep them moist and helps them move. The mucus also can protect the slugs from pathogens. A slug's mucus is a component of which part of the immune system?
A) internal innate immunity B) external innate immunity C) adaptive immunity D) lymphatic system