If blood pH falls outside of the normal range for too long, which system suffers most?
a. skeletal system
b. muscular system
c. cardiovascular system
d. central nervous system
e. respiratory system
D
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What is true of the Cambrian explosion?
A) There are fossils of animals in geological strata that are older than the Cambrian explosion. B) Only the fossils of microorganisms are found in geological strata older than the Cambrian explosion. C) The Cambrian explosion is evidence for the instantaneous creation of life on Earth. D) The Cambrian explosion marks the appearance of filter-feeding animals in the fossil record.
A species of the genus Streptococcus is the leading cause of
A. tuberculosis. B. urinary tract infections. C. contaminated milk and meat. D. "flesh-eating" bacterial infections. E. food poisoning from rice.
Mitosis is a process that is unique to humans
a. True b. False
The most common form of calcium has 20 protons, 20 nuetrons and 20 electrons. Which of the following element is an isotope of calcium?
a. an atom with 21 protons, 20 neutrons, 21 electrons b. an atom with 20 protons, 20 neutrons, 18 electrons c. an atom with 21 protons, 21 neutrons, 21 electrons d. an atom with 20 protons, 21 neutrons, and 20 electrons