A key innovation that helped sporophyte dominant plants survive in high, dry environments is ____
a. flagellated sperm
b. the cuticle
c. xylem
d. phloem
e. lignin
ANSWER: b
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During which Period was there lush vegetation, the age of the dinosaurs and the break up of Pangea?
a. Cambrian b. Mesozoic c. Paleozoic d. Jurassic e. Cretaceous
American alligators are living members of this lineage
a. Testudines b. Archosauromorpha c. Squamata d. Sphenodontia e. Amphibia
What is a SNP?
a. a computer chip that recognizes differences in DNA sequences b. a variation in a single nucleotide of a DNA sequence c. a tool used in DNA research to cut segments of DNA d. a drug developed from DNA technology e. a highly conserved sequence of DNA
Which organ's smooth muscles need to contract in order to reduce air movement to the mammalian respiratory surfaces?
a. those of the epiglottis b. those of the large bronchi c. those of the bronchioles d. those of the trachea