In allopatric speciation, daughter species usually form
a. abruptly.
b. in proportion to the parental stock.
c. rapidly, but are then reduced by environmental factors.
d. gradually over rather long periods of time.
e. in the same homeland.
d
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In the flower diagram shown above, the item labeled "1" is the
a. filament. b. sepal. c. receptacle. d. style. e. ovule.
Which factor is directly involved in calculating NPP?
A) the change in growth of the human population B) the amount of solar energy converted to chemical energy by plants C) the amount of chemical energy required by plants to support themselves D) the number of births and deaths in a population over one year
Steroid hormones bind with G-protein linked receptors in plasma membranes of target cells. Indicate whether the statement is true or false
Based on the chart, which of the following would be the most reasonable plan for the students to follow?
(A) Searching horizontal rock layers in any class of rock and trying to find those that contain the greatest number of fossils (B) Collecting fossils from rock layers deposited prior to the Permian period that contain some early vertebrate bones (C) Looking in sedimentary layers next to bodies of water in order to find marine fossils of bivalves and trilobites (D) Using relative dating techniques to determine the geological ages of the fossils found so they can calculate the rate of speciation of early organisms