The phylogenetic species concept holds that the definition of a species should be

A. based on branching relationships among species.
B. based on reproductive compatibility.
C. based on evolutionary relationships.
D. variable depending on the type of organism.


Answer: A

Environmental & Atmospheric Sciences

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Narrow surface currents that flow in the same general direction as the approaching waves are:a

rip currents. b. nearshore currents. c. longshore currents. d. upwelling currents. e. refraction currents

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Radiocarbon dating is useful in dating event that occurred within the past________

a) 4 thousand years b) 40 thousand years c) 400 thousand years d) 4 million years e) 40 million years

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Evaluate how the location of ancient cultural hearths has influenced modern population distribution

What will be an ideal response?

Environmental & Atmospheric Sciences

Please compare and contrast muscovite and biotite.

a. Both muscovite and biotite are feldspars that have cleavage in two directions and have a shiny luster. However, unlike clear muscovite, biotite is black because it contains iron and magnesium. b. Both muscovite and biotite are micas that have cleavage in two directions and have a shiny luster. However, unlike clear muscovite, biotite is black because it contains iron and magnesium. c. Both muscovite and biotite are micas that have cleavage in one direction and have a shiny luster. However, unlike clear muscovite, biotite is black because it contains iron and magnesium. d. Both muscovite and biotite are micas that have cleavage in one direction and have a shiny luster. However, unlike clear biotite, muscovite is black because it contains iron and magnesium. e. Both muscovite and biotite are feldspars that have cleavage in one direction and have a shiny luster. However, unlike clear muscovite, biotite is black because it contains iron and magnesium.

Environmental & Atmospheric Sciences