Which statement is true about speciation on island archipelagos?
A. Speciation is slow because it depends on emigration from the mainland.
B. Most speciation occurs allopatrically.
C. Ecological competition may cause new species to go extinct slowing speciation.
D. Speciation by polyploidy is most common.
E. Species clusters are less common.
B. Most speciation occurs allopatrically.
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High productive agricultural soils; long, cold winters; perennials; grazing mammals and burrowing rodents; fires.
A. desert B. savanna C. taiga D. temperate grassland E. tropical rain forest
Very early in development, each cell is capable of expressing all its genes. This is referred to as
A. determination. B. specification. C. bipotential induction. D. totipotency. E. multipotency.
Identify the key feature of the action potential that ensures it will travel only one direction.
A. the activation state of the voltage-gated Na+ channel B. the inactivation state of the voltage-gated Na+ channel C. the activation state of the voltage-gated K+ channel D. the inactivation state of the voltage-gated K+ channel E. the temporary cessation in activity of the Na+/K+ pump
The ____ of an atom have a negative charge
a. nuclei b. protons c. neutrons d. ions e. electrons