Why are emperor penguins considered a species?
a. they all look alike.
b. they can mate and produce offspring that can mate.
c. they can mate and produce offspring that cannot mate.
d. they all walk in a similar manner.

Look at the figure above. which atmospheric layer has around 80 percent of the mass of the earth's atmosphere? (hint: it's where the clouds seen on earth are formed.) a. exosphere b. troposphere c. stratosphere d. thermosphere

Prior to the mt. st. helens eruption on may 18, 1980, satellite and topographic views of the volcano were captured. based on the topographic map of mt. st. helens, what is the contour interval if the volcano height is 2,950 m? question 9 options: 600 m 400 m 750 m 500 m

What are the pros and cons of transect sampling?