Turbellarian flatworms have a distinct head. When compared to the head of an insect, what is the flatworm head missing? rev
A. Sensory organs
B. Light sensitive structures
C. Anterior collection of nerve cells
D. A mouth
D. A mouth
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In which disorder is the neural control of the breathing cycle disrupted?
a. emphysema b. asthma c. lung cancer d. bronchitis e. apnea
The body of a cnidarian is supported by a(n) hydrostatic skeleton
____________________ Indicate whether the statement is true or false.
Which statement is true regarding bacteria?
A) All bacteria are pathogens and harmful to humans. B) Some bacteria are pathogens and harmful to humans, whereas lots of bacteria are helpful to humans. C) All bacteria are helpful to humans. D) All bacteria are pathogens, but some harm humans more than others.
You notice that the majority of the electrons in NaCl spend their time around the chlorine. You also notice that the electrons in H2 are evenly distributed among the two atoms. Which two types of bonds are represented in these molecules?
A. covalent bonds in NaCl; ionic bonds in H2 B. ionic bonds in NaCl; ionic bonds in H2 C. ionic bonds in NaCl; covalent bonds in H2 D. covalent bonds in NaCl; covalent bonds in H2