When scientists use the scientific method, they use terms to indicate their degree of certainty. Which of the following terms conveys the least degree of certainty?
A) theory
B) hypothesis
C) law
D) both hypothesis and theory
E) both theory and law
B) hypothesis
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Sulfide is toxic to respiring organisms, because it can combine with metals present in ________ that serve a critical function in respiration
A) glycolysis enzymes B) oxidases C) NADH D) cytochromes
Which group has the largest number of chromosomes?
a. hepatophytes b. gymnosperms c. angiosperms
d. lycophytes e. charophytes
The spiracle in conjunction with a ventral gill in skates and rays is an adaptation that allows them to:
a. be nekton. b. have a bottom existence. c. position their mouth ventrally. d. avoid detection by predators. e. filter feed on plankton.
Which of the following is the proper order of cells for water and minerals to travel from the soil into the xylem?
A. endodermis, cortex, epidermis, endodermis B. root hair, cortex, endodermis, xylem C. root hair, endodermis, cortex, xylem D. root hair, cortex, epidermis, endodermis E. root hair, cortex, endodermis, phloem, xylem