Forests containing ____ trees once stretched unbroken across eastern North America, Europe and eastern Asia before

farmers cleared the land.



a. white spruce and balsam fir
b. sages
c. epiphytes
d. teak
e. ash, beech, birch, elm, and oak


ANSWER: e

Biology & Microbiology

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_______ describes a chromosome that has a centrally-placed centromere. Fill in the blank(s) with the appropriate word(s)

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Human cells are most radiosensitive during the _____ phase of the cell cycle.

a) gap2 b) gap1 c) mitosis d) synthesis

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Sometimes premature babies suffer from respiratory distress syndrome. What substance would you administer in a breathing tube to the infant?

A) antibiotics B) surfactant C) anti-inflammatory drugs D) hydrocortisone

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