When a dog's brain detects the need to dissipate excess heat and the dog begins to pant, the brain acts as the ________, and the panting behavior acts as the ________.
A. stimulator; effector
B. integrating center; sensor
C. sensor; integrating center
D. integrating center; effector
Answer: D
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Cotyledons are the __________ of a plant
a. developing seeds b. first developing leaves c. gametes d. stored energy
Members of the phyla Ectoprocta, Brachipoda, and Phoronida all possess a lophophore, which is
a. a cluster of pores along the aboral surface, used for expelling wastes from the digestive tract. b. a hard shell made of calcium carbonate. c. an outpocket of the digestive tract, where metabolic wastes are processed before emptying into the digestive tract for expulsion. d. a circular fold with one or two rows of hollow, ciliated tentacles. e. an extra body cavity surrounding the digestive tract filled with muscles used for locomotion.
Which property is true of living things?
a. They are stable over time. b. They are stable over many generations. c. They use protein as their hereditary material. d. They must obtain all organic molecules of life from external sources. e. They consist of one or more cells.
Saliva contains the enzyme __________, which begins the process of starch digestion. Fill in the blank(s) with the appropriate word(s)