Which of the following characteristics is often associated with animals that are radially symmetrical?
A) Gastrovascular cavity
B) Sessile or otherwise nonmobile
C) Cephalization
D) Mobility
E) Mesoderm
B
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Heterospory refers to having ____
a. both male and female gametes b. two types of spores in two different types of sporangia c. both male and female parts on the same plant d. separate male and female plants e. both sporophyte and gametophyte generations
Tree rings occur when _____
a. there are droughts during the time the rings form b. environmental conditions influence xylem cell size c. heartwood alternates with sapwood
Testosterone and other androgens are required for ______ in men.
A. spermatogenesis B. primary sex characteristics C. secondary sex characteristics D. two of the above E. all of the above
Viruses that alter host genetic material may cause oncogenic effects.
a. true b. false