The oldest modern human is
A. Homo habilis.
B. Homo ergaster.
C. Homo rudolfensis.
D. Homo heidelbergensis.
Answer: D
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Which of the following is not a defining trait of the phylum Chordata?
A. notochord B. dorsal hollow nerve cord C. pharyngeal slits D. post anal tail E. protostome development
It is thought that viruses may have originated
from cells because
a. of their small size. b. they are pathogens. c. they can only replicate within a host cell. d. they do not have organelles. e. more than one of these
Before a stoma opens:a
the level of carbon dioxide inside the leaf increases. b. potassium ions are actively transported out of guard cells. c. potassium ions are actively transported into guard cells. d. the turgor pressure inside the guard cells decreases. e. water moves by osmosis out of the guard cells.
Which four elements make up approximately 96% of living matter?
A) Carbon, oxygen, calcium, sulfur B) Carbon, hydrogen, nitrogen, oxygen C) Oxygen, hydrogen, calcium, sodium D) Carbon, phosphorus, hydrogen, sulfur E) Carbon, sodium, chlorine, magnesium