Which time period would hold the record of the oldest fossils of multicellular animals, found in mountainous areas of
South Australia, and parts of Canada and China?
a. Edicarian
b. Devonian
c. Cambrian
d. Cretaceous
e. Ordovician
a
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Within a landscape mosaic, patches
A) are composed of relatively heterogeneous communities. B) typically lack a distinct boundary. C) tend to be similar in size. D) tend to vary in shape.
The biggest problem facing coastal habitats is not dumping but:
a. overfishing. b. river runoff. c. development. d. offshore oil spills. e. nuclear power plant leakage.
Nonsense codons are
A) codons that code for multiple amino acids. B) codons that do not code for an amino acid. C) codons that can be read forward or backward. D) start codons.
Which of the following best describes the nature of the sieve element cells of mature, functioning phloem?
A) living, thick-walled tubes B) dead, thick-walled tubes C) dead cells that retain some organelles and some maintenance functions D) living cells that have lost their nucleus