The human population is now over 6.8 billion. It reached 6 billion in _____
a. 2007 c. 1802
b. 1999 d. 1350
B
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Which of the following differentiate(s) humans from other living things?
1.cellular chemistry and organization 2.evolutionary traits 3.ability to build homes 4.use of water and fire
Steroid hormones are derived from
a. free fatty acids. b. cortisol. c. tyrosine. d. cholesterol. e. alanine.
Which of the following is NOT a characteristic of a genus name?
A. it is usually an adjective. B. it is written before the specific epithet. C. it is always capitalized. D. it is either underlined or in italics. E. it is one of two names used to identify an organism.
Major changes in ocean conditions during the early Cambrian period were probably linked most closely to the evolution of __________.
a. cyanobacteria b. algae c. suspension-feeding animals d. large and motile predatory animals e. vertebrates