Which two letters in the diagram above identify
parts of the lipid bilayer?
A and D
A and E
B and C
C and D

What is the relationship between absorbance of light and the rate of photosynthesis?

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.

Which structure in the cardiovascular system connect arteries to veins?