________ groups contain only some of the descendants of a common ancestor
Fill in the blank(s) with correct word
Paraphyletic
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What is the main reason for using food webs instead of food chains in analyzing ecosystems?
I) Most organisms eat more than one type of food. II) Most organisms feed at several trophic levels. III) The decomposition cycle needs to be shown. A) only I B) only II C) only III D) only I and II E) I, II, and III
What percentage of microbes have been cultured in the laboratory?
A. 10% B. 1% C. 20% D. 30%
Restriction enzymes ____
a. work at recognition sites b. function only at "sticky ends" c. produce uniform lengths of DNA d. function in viruses e. are produced by viruses to break down bacterial DNA
All birds practice internal fertilization, even though most male birds lack a penis.
Answer the following statement true (T) or false (F)