The result of double fertilization in an
angiosperm is
a. two embryos.
b. an embryo and a megaspore
c. an embryo and endosperm.
d. an embryo and a pollen grain.
e. an embryo and a female gametophyte.
C
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In females, the egg passes from the ovary to the uterus via the __________, and fertilization
occurs in the __________.
a. oviduct; oviduct b. oviduct; uterus c. urethra; oviduct d. urethra; vagina
Rosalind Franklin's research contribution was
essential in
a. establishing the single-stranded nature of DNA. b. establishing the principle of base pairing. c. establishing most of the principal structural features of DNA. d. sequencing DNA molecules. e. determining the bonding energy of DNA molecules.
Articular cartilage
What will be an ideal response?
Which feature is believed to have been the first step in the evolution of land plants from the green algae?
A. evolution of vascular tissue B. evolution of seeds C. evolution of flowers in order to attract pollinators D. protection of the embryo E. evolution of microphylls