What feature do the carbon and nitrogen cycles have in common?
A. a large atmospheric component
B. involvement in global climate change
C. often a limiting nutrient
D. mostly local cycling
E. many microbes involved in cycling
A. a large atmospheric component
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Metallic ions such as Ca2+, Na+, and Fe3+ readily form ____
a. polar covalent bonds b. van der Waals forces c. ionic bonds d. hydrogen bonds e. nonpolar covalent bonds
Features that contributed to success on land include a __________ that protects spores. Fill in the blank(s) with the appropriate word(s)
Ionic bonds
A) are electrostatic forces of attraction between oppositely charged ions and form when electrons are transferred from atom to another. B) form when electrons are transferred from atom to another and only exist as ions in solution. C) are electrostatic forces of attraction between oppositely charged ions. D) only exist as ions in solution. E) form when electrons are transferred from atom to another.
A goiter is caused by a deficiency in:
a. thyroxine only b. triiodothyronine only c. calcium d. iodine e. thyroxine and triiodothyronine