Farmers often grow legumes such as soybeans every few years and plow much of the plant parts into the soil. This
practice serves mainly to replenish the soil with useful forms of ____.
a. carbon
b. nitrogen
c. phosphorus
d. oxygen
e. manganese
ANSWER: b
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Molecules made primarily of carbon and hydrogen are called hydrocarbons. How many hydrogen atoms are present in each of the following molecules? A hydrocarbon chain of five carbons joined to each other by single covalent bonds?
A. 6 B. 8 C. 10 D. 12
Which of the following kinds of fungi is NOT a basidiomycete?
A. mushroom B. shelf fungus C. smuts D. morels E. puffballs
What statement is correct in the following statment?
A. Speciation that begins with geographic isolation is known as allopatric speciation B. Allopatric speciation only happens in dispersal geographic isolation C. Speciation that begins with geographic isolation is known as sympatric speciation D. Sympatric speciation only happens in dispersal geographic isolation
Which of the following characteristics is associated with all animals that are bilaterally symmetrical at some point in their life cycle?
A) Cephalization B) Coelom C) Gastrovascular cavity D) Lack of organs E) Mesoderm