The sieve plate, stone canal, circular canal, and radial canals of a sea star are structures of the
(a) nervous system.
(b) water-vascular system.
(c) digestive system.
(d) excretory system.
(b) water-vascular system.
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In __________, an anus forms first. Fill in the blank(s) with the appropriate word(s)
If the results of a chi-square test of a given set of data show a P value greater than 0.05, then the null hypothesis
A) must be rejected. B) must be accepted. C) must be rephrased. D) cannot be rejected. E) cannot be accepted.
In a lactating mammal, the two hormones that promote milk synthesis and milk release, respectively, are _____
A) prolactin and calcitonin B) prolactin and oxytocin C) follicle-stimulating hormone and luteinizing hormone D) luteinizing hormone and oxytocin
Chemoreceptors include
A) Pacinian corpuscles. B) hair cells. C) free nerve endings. D) rods. E) olfactory receptors.