The hominid australopithecines are generally accepted to be different from modern humans because
A. only humans are bipedal.
B. the human skull is apelike in appearance with a strongly projecting face.
C. only humans are meat eaters.
D. human brains on an average are at least twice as large in size.
E. human arms are longer than legs.
Answer: D
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When you compare Australian marsupials to placental mammals today
Marsupials are a very ancestral form of mammal, evolving before placental mammals over 70 million years ago. Today Australian marsupials can be compared to placental mammals on other continents.
A. the marsupials are all very primitive, having changed very little during the last 70 million years.
B. the marsupials are very similar to placental mammals in the ways they have adapted to similar ecological niches.
C. the marsupials have evolved much more rapidly than placental mammals and are more highly adapted.
D. the marsupial fossils look remarkably similar to the placental mammals of today.
E. living marsupials are little changed from the earliest marsupial fossil forms.
Visual pigments are made from opsin and ____
a. rhodamine b. cytochromes c. phytochromes d. retinal e. vitamin D
The parent material of soils originating from sand and silt carried by the wind is referred to as ________
Fill in the blank(s) with correct word
Why do cigarette smokers cough more than most people do?
A) The tar in cigarette smoke tends to make alveoli stick closed. Coughing opens them. B) Coughing is the respiratory system's attempt to clear itself of the thick mucus that is produced in response to smoke exposure. C) Cigarette smoking partially paralyzes the lungs; coughing exchanges the resultant "dead air." D) Coughing stimulates blood flow to the lungs.