Which of the following is necessary for strong bones and teeth, nerve conduction, muscle contraction, and blood clotting?
A. sodium
B. sulfur
C. iron
D. magnesium
E. calcium
Answer: E
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Which of the following statements best describes the Hox genes of the different groups of animals?
A. All animals have Hox genes. B. Invertebrate chordates have one cluster of Hox genes. C. Gnathostomes have four clusters of Hox genes. D. Hox genes are involved with the evolution of structural complexity. E. All the choices provided are correct.
Among the types of microorganisms, the ________ are noncellular.
A. protozoans B. bacteria C. helminths D. viruses
In a competitive interaction in which species 1 has a higher carrying capacity (K1 ) than species 2 (K2 ), it is expected that species ________ will go extinct
Fill in the blank(s) with correct word
The structure in the eye that focuses light onto photoreceptors is the ____
a. sclera b. pupil c. iris d. lens e. ciliary muscle