What is one of the most damaging issues in freshwater systems that has caused the highest number of declines in fish?
A) pollution
B) dams
C) climate change
D) ozone depletion
B
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At the end of meiosis, the number of chromosomes in each daughter cell is halved because meiosis has
A) two cell divisions after no DNA replication. B) two cell divisions after one DNA replication. C) one cell division after two DNA replications. D) one cell division after one DNA replication.
If one compares the forearm of a human, dog, bird, and whale and finds that they indicate common ancestry, what would we call these structures?
a. vestigial structures b. archetype features c. homologous structures d. ancestral forms
How many different codons are possible with the four different nucleotides?
A. 55 B. 128 C. 64 D. 12 E. 24
The tail on a sperm cell is the only example of a flagellum in the human body.
a. true b. false