d . The notochord of non-vertebrate chordates does not become a vertebral column .
e . Non-vertebrate chordates do not have a internal bony skeleton while all other chordates do .
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Question 10
Which of the following characteristics is NOT a distinguishing feature of all primates ?
Select one :
a . opposable thumb
b . fingernails
c . usually single birth
d . extended period of parental care
e . expanded hindbrain
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Question 11
Which of these is a proper contrast between birds and mammals ?
Select one :
a . Birds are cold-blooded ; mammals are warm-blooded .
b . Birds are egg laying ; no mammals lay eggs .