Earthworms have multiple hearts that pump blood throughout the body in vessels. They also ingest soil, digest the organic matter, and eliminate the indigestible particles as castings. Earthworms have which of the following?
A. an incomplete digestive tract and a partially open and closed circulatory system
B. a complete digestive tract and open circulatory system
C. an incomplete digestive tract and open circulatory system
D. a complete digestive tract and closed circulatory system
E. an incomplete digestive tract and closed circulatory system
D. a complete digestive tract and closed circulatory system
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Cleavage in a frog embryo takes place more quickly in the vegetal half
Indicate whether the statement is true or false.
The scientific explanation for the diversity seen in
nature is a. based upon sexual differences. b. divine creation of the many different forms of life. c. found in the science of taxonomy. d. natural selection. e. artificial selection.
The Gram-positive diplococcus ________ is commonly found in the pharynx but may invade the central nervous system inside cells where it survives after endocytosis
A) Streptococcus agalactiae B) Listeria monocytogenes C) Haemophilus influenzae D) Neisseria meningitidis E) Streptococcus pneumoniae
Hepatitis C is an acute disease.
Answer the following statement true (T) or false (F)