Features that contributed to success on land include __________ and __________ (two types of vascular tissues). Fill in the blank(s) with the appropriate word(s)
ANSWER: xylem; phloem
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The most heavily colonized human organ by bacteria is the ________, containing 1011-1012 bacterial cells per g
A) mouth B) small intestine C) large intestine D) skin
Northern elephant seals (Mirounga angustirostris) come up on a beach during breeding season. Males arrive first and establish a territory by posturing and fighting with other males. The posturing and fighting behaviors are probably the result of _________
A. intrasexual selection B. intersexual selection C. competition D. kin selection E. group selection
Natural selection results in organisms perfectly adapted to their environments
a. True b. False
Which of the following is not a major class of growth factors?
A. Nucleic acids B. Amino acids C. Purines and pyrimidines D. Vitamins