Which of the following has the longest fossil record?
A. Homo neanderthalensis
B. Homo erectus
C. Homo sapiens
D. Homo habilis
E. Homo heidelbergensis
Answer: B
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An animal with an open circulatory system
a. lacks a continuous network of blood vessels that contain the blood at all times. b. can have only one heart. c. has two separate vascular circuits. d. is able to distribute substances faster than a closed system. e. can grow larger than one with a closed circulatory system.
Dizygotic twins are also called fraternal twins. Indicate whether the statement is true or false
A(n) ____ includes the entire genome.
A. cDNA library B. transcribed library C. genomic library D. RNA library E. plasmid library
Most cases of hookworm infection are acquired by ingestion of adult forms in contaminated food or water
Indicate whether the statement is true or false