More than ____ percent of couples decide to terminate a Down syndrome pregnancy
a. ten
b. thirty
c. fifty
d. seventy
e. ninety
e
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The two factors that contribute to water uptake by the plant are ________ and ________
a. transpiration / photosynthesis b. positive pressure / tension c. active transport / transpiration d. respiration / translocation
The water inside the ring of an atoll is isolated from the open ocean and is usually less saline
Indicate whether the statement is true or false
An extreme case of Rh disease is known as
a. hemolytic disease of the newborn. b. Down syndrome. c. Tay-Sachs disease. d. sickle cell anemia. e. polycythemia.
Chronosequences are useful because one can
A) view several taxa in one sere. B) view several seres in one region. C) measure the impacts of disturbance. D) count the number of trees in one sere.