Birth control injection (e.g. Depo-Provera) is __________.
[A] effective for 3 months
[B] obtained without a prescription
[C] given in the arm
[D] a way of preventing STDs
Answer: A and C
[A] effective for 3 months
[C] given in the arm
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What kind of bonds hold the two strands of the DNA molecule together?
a. glycosidic b. phosphodiester c. hydrogen d. tetravalent
Humans are not the only animals known to use tools. Crows have been observed using twigs to extract food from holes or carry objects they would be unable to hold in their beaks. When presented with unreachable food floating in a narrow tube, crows will find small objects, such as pebbles, to drop into the tube, raising the water level until they can reach their prize. What kind of behavior does this demonstrate?
a. operant conditioning b. classical conditioning c. cognitive learning d. innate behavior
Water potential, the inherent capacity of water molecules to move from one site to another when
conditions dictate, is typically represented by the Greek letter ____.
a. ? b. ? c. ? d. ? e. ?
How do marine polychaetes use chitin hardened body parts?
a. as an excretory organ b. the chitin hardened tentacles, to move sand c. to chew and digest prey d. the chitin-hardened jaws, to capture prey e. the chitin-reinforced bristles, for movement and chitin hardened jaws to capture prey