Which of the following statements is true?
A) The valence electrons are only from s and p orbitals in the valence shell.
B) All of the electrons in the valence shell are valence electrons.
C) The valence electrons are always paired in the valence shell.
D) Paired valence electrons are more unstable than unpaired valence electrons.
E) Nonbonding electrons are not found in the valence shell.
A
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Which of the following staple (basic food) crops is incorrectly located?
A. wheat and barley in southwestern Asia B. rice and millet in China C. corn, squash, beans, potatoes, tomatoes and papers in the Americas D. watermelon and black-eyed peas in Africa
Which of the following was critical for the adaptation of reptiles to terrestrial ecosystems?
a. the amniote egg d. endoskeleton b. protective mechanisms e. A and C c. exoskeleton
Discuss the role that palynology can play in the study of ancient ecosystems. What will be an ideal response?
Red tides are caused by ________
A) increased ocean oxygen content B) the position of the moon C) increased ocean carbon dioxide content D) sharks attacking harbor seals and walruses E) elevated nutrient levels