In organogenesis, the ectoderm gives rise to:
a. muscle.
b. the digestive tract.
c. sense organs.
d. the circulatory system.
e. skeletal tissue.
c
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What was the immediate cause of the end-Cretaceous extinction event?
a. a gamma-ray burst b. rising sea levels c. an asteroid impact d. increased sunspot activity
Communal courting areas are called
A. mating structures. B. breeding grounds. C. resource areas. D. territories. E. leks.
Choose the letter of the best match from the following:A. cognitionB. waggle danceC. navigationD. filial imprintingE. fixed action patternA form of communication in honeybees.
Fill in the blank(s) with the appropriate word(s).
Ernest Rutherford's key experiment on alpha particle bombardment of gold foil was important to the development of
A. the concept that atoms have a homogenous distribution of protons throughout the atom. B. gold as an element. C. the modern model for atomic structure. D. detection methods for protons. E. alpha particle emitters.