What is the life span of a species?
A) the span during which a living species is observed in the wild
B) the duration of time that a species doesn't change
C) the span of rock ages over which fossils of a species occur
D) the period of time that it takes for an individual to reach adulthood, reproduce, and die
C
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Sharks are positively buoyant in seawater
Indicate whether the statement is true or false
Red blood cells contain 2% salt. What will happen when the cell is placed in a 10% salt solution?
a. The cell will burst. b. The cell will shrink. c. The cell will remain unchanged, but salt will diffuse out of the cell. d. The cell will remain unchanged, but salt will diffuse into the cell. e. The cell will remain unchanged, but water will diffuse out of the cell.
Which pathway leads to the detrital food chain?
A) W B) P C) R D) I
When a molecule absorbs a photon, one of its electrons is raised to the ________ state
A) energetic B) quantum C) positive D) excited