Advanced treatment of sewage
A. is done to prevent nutrient enrichment.
B. is done to prevent possible overproduction of algae and other organisms.
C. involves the removal of phosphates and nitrogen compounds.
D. All of the choices are correct.
D. All of the choices are correct.
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Answer the following statements true (T) or false (F)
1. Animals are monophyletic. 2. The terms "dorsal" and "oral" are synonyms. 3. A pseudocoelom is a cavity that develops embryonically into the coelom. 4. Gastrulation is the development of the gastrula into an embryo. 5. A hydrostatic skeleton has no bones or cartilage.
The large intestine concentrates undigested material by
A. absorption of salts and water across the epithelial surface of the lumen. B. ingestion of excess salts and water by intestinal bacteria. C. transporting excess salts and water back to the small intestine for absorption. D. storing excess salts and water in the cecum.
Thigmotropism is a growth response to ____
a. light b. day length c. contact with a solid object d. circadian rhythms e. gravity
Which of the following is a lipid-derived hormone?
a. thyroxine b. human growth hormone c. estradiol d. insulin