Rays are a type of ________
A) tunicate
B) cartilaginous fish
C) jawless fish
D) bony fish
B
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The test tubes in the photograph contain Benedict’s solution and two unknown substances that have been heated. What do the results indicate for each substance?
What will be an ideal response?
Trees with needle-shaped leaves and a thick cuticle with stomata sunk below the leaf surface dominate
____________________. Fill in the blank(s) with the appropriate word(s).
"Toilet training" in children involves control of the
a. internal urethral sphincter. b. urinary bladder. c. kidneys. d. Bowman's capsule. e. external urethral sphincter.
Natural form of passive immunity involves the transfer
A) IgA antibodies to an infant through the mother's milk. B) IgG antibodies to an infant through the mother's milk. C) IgG antibodies by kissing. D) IgE antibodies by sneezing. E) IgA antibodies across the placenta.