In a typical temperate zone forest, the concentration of co2 in the air fluctuates with (choose any/ all that apply, points deducted for incorrect choices)
a. season of the year
b. phase of the moon
c. soil temperature
d. forest age
e. time of day
f. canopy height

Which of these is true of the cytoplasm of an unfertilized egg? a. it is an unevenly distributed mixture of mrna, proteins, organelles, and other substances. b. it does not contain substances that are important in directing development. c. these substances are supplied by the sperm. d. it does not contain substances that are important in directing development. e. development is directed solely by the surrounding cells. f. it is a homogeneous mixture of mrna, proteins, organelles, and other substances. g. it does not contain substances that are important in directing development. h. these substances are produced by the dna of the fertilized zygote.