Which of the following is NOT a major type of marine ecosystem? a estuary
C. surface zone
b. intertidal area
d polar ice

Which of the following is the most likely result of converting forestland to urban development? a.the amount of land available for lumber production decreases. b.fewer trees are needed because cities are made mainly of concrete. c.people discover more efficient ways to grow trees. d. the price of lumber goes down.

Human genes only differ by less than percent. a. 1 b. 6 c. 11 d. 16

Discuss cell surface transport in the structure of constituents