Which substance is found in RNA but not in DNA?
a. thymine
b. deoxyribose
c. ribose
d. guanine
e. cytosine
C
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If you were a conservation biologist in charge of the recovery plans for an endangered species, which would you prefer to find within that species—an even distribution of age classes or a pyramid-shaped age distribution? Why?
What will be an ideal response?
Most members of the phylum Platyhelminthes
a. are free-living. b. exhibit radial symmetry. c. do not show cephalization. d. are of a single sex. e. are parasites.
The __________ gland produces hormones and is the site where __________ (a kind of white blood
cell) mature. Fill in the blank(s) with the appropriate word(s).
The formation of feathers, hair, and reptilian scales is based on completely different developmental patterns and genetic influences.
Answer the following statement true (T) or false (F)