In the following community, which serves as the keystone species?
A) killer whales
B) sea otters
C) sea urchins
D) kelp bed
B
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Circulatory systems
a. are found in all animals. b. result in slow distribution of nutrients and gases. c. include one or more hearts. d. are always closed systems. e. are all of these
In reabsorption,
a. plasma proteins are returned to the blood. b. excess hydrogen ions are removed from the blood. c. excess water is passed on to the urine. d. nutrients and salts are selectively returned to the blood. e. drugs and foreign substances are passed into the urine.
One goal of pedigree analysis is to discover whether the gene in question is located on an X or a Y chromosome or on
a(n) ____________________.Fill in the blank(s) with the appropriate word(s).
A genetic cross was performed with two pea plants both with green, wrinkled seeds. Of the resulting offspring, 75% had green, wrinkled seeds and 25% had green, smooth seeds (W = wrinkled; w = smooth)
With regard to wrinkled versus smooth seeds, the parental plants must have been ________. Fill in the blank with correct word.