According to the fossil record, when did the earliest animals appear on Earth?
A. 600 million years ago
B. 3 billion years ago
C. 3500 million years ago
D. 520 million years ago
E. 55 million years ago
A
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A trait is a(n) ____________________ property of an organism
Fill in the blank(s) with correct word
Which of the following brings amino acids to the ribosomes?
A) ribosomal RNA B) transfer RNA C) messenger RNA D) introns E) exons
As a result of deforestation, the number of different habitats in a particular locale declines while, at the same time, the rate of cladogenesis in a particular lineage of animals in this locale increases. Choose the feature that most likely accounts for this observation.
A) adaptive radiation B) allopolyploidy C) autopolyploidy D) increased habitat differentiation E) increased sexual selection
Angiosperms are thought to have originated about __________ years ago.
a. 100 million b. 450 million c. 360 million d. 500 million e. 140 million