The hormones that are most directly involved with the process of birth are ____
a. estrogen and oxytocin
b. oxytocin and prostaglandins
c. oxytocin and progesterone
d. prolactin and estrogen
e. prostaglandin and progesterone
ANSWER: b
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In many animals, this polysaccharide is found in large quantities in liver and muscle cells. It is highly branched, with
many a(1-4) and a(1-6) linkages.
a. chitin b. amylopectin
c. cellulose d. glycogen e. amylose
Pelagic organisms live:
a. in the water column. b. on the sediment. c. in the sediment. d. in hydrothermal vents. e. close to shore.
If you were designing a new insecticide absorbed via the respiratory system in arthropods, the killing chemical would enter the invertebrate through the
A. epidermis. B. tracheae. C. alveoli. D. bronchioles. E. gills.
What is the name of the main embryonic cell layer from which the nervous system is derived in most metazoans?
a. endoderm b. mesoglea c. mesoderm d. ectoderm