What is the maximum number of electrons in the first energy shell of an atom?
A. 8
B. 32
C. 4
D. 2
E. 18
Answer: D
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What can Antarctic ice core samples tell us about atmospheric CO2 levels? Select all that apply
A. Nothingâ€"ice is made of H2O and not CO2. B. CO2 ice core data confirms CO2 measurements taken directly from the atmosphere. C. Ice cores can help scientists estimate atmospheric CO2 levels from centuries ago. D. Ice cores can tell scientists exactly what plants lived on Earth centuries ago.
Which of the following species is endangered
a. California sea lion b. northern fur seal c. Steller's sea lion d. both a and b
During DNA replication, which enzyme assembles the new DNA strands?
a. DNA polymerase b. RNA polymerase c. DNA replicase d. DNA helicase e. DNA-RNA synthase
What is the main way that a beaver can be a keystone species in its ecosystem?
a) it can serve as a food source b) it can introduce diseases into the ecosystem c) it can act as a predator d) it can provide aquatic habitat