To understand the population structure biologists conduct studies to determine all below except
a. population size.
b. age.
c. ocean conditions.
d. sex ratios.
e. growth rate.
C
Biology & Microbiology
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Secondary metabolites that function to protect plants from viral, fungal and bacterial pathogens are
a. systemins. b. phytoalexins. c. PR proteins. d. R genes. e. heat-shock proteins.
Biology & Microbiology
In 2006, the U.S. generated __________ tons of
trash. a. 22 billion b. 251 million c. 29 million d. 200 million e. none of these
Biology & Microbiology
Shingles is caused by reemergence of the _______ virus.
A. Epstein-Barr B. measles C. chicken pox D. flu
Biology & Microbiology
Flowering plants appeared in the fossil record in the:a
Cenozoic era. b. Late Cretaceous period. c. Paleozoic era. d. Jurassic and Lower Cretaceous periods. e. Tertiary period.
Biology & Microbiology