Match the type of circulatory system with the organism in which it is found.
A. Clams and oysters
B. Grasshoppers
C. Earthworms
A. Open circulatory system
B. Open circulatory system
C. Closed circulatory system
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Hormonal regulation of digestive functions is an example of the interaction between the digestive
system and which other system? a. nervous b. reproductive c. cardiovascular d. integumentary e. endocrine
In places where the public sanitation is poor, people run the risk of getting ____
a. West Nile virus b. cholera c. SARS d. anthrax e. mononucleosis
Sea turtle populations are threatened with extinction by natural dangers, and humans increase that threat because sea turtles
A) are spreading into coral reefs. B) are difficult prey for human poachers to capture. C) are caught in nets along with other species being fished. D) are overexploited as pets. E) are overexploited for research and development.
In humans, genes make up ______ of the DNA.
about 10% about 75% 85% less than 5% about 50%