The origins of 300 or more species of cichlid fish in Lake Malawi can best be explained by
A) adaptive radiation.
B) the fossil record.
C) polyploidy.
D) premating isolating mechanisms.
E) random events.
A
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A population's carrying capacity _____
A) may change as environmental conditions change B) can be accurately calculated using the logistic growth model C) generally remains constant over time D) increases as the per capita growth rate (r) decreases E) can never be exceeded
Where are the proteins needed for photosynthesis produced? (Select all that apply.)
A) in the cytoplasm B) in the chloroplasts C) in the nucleus D) in the mitochondria
Octopuses and squid may not necessarily be smarter than other invertebrates because:
a. all invertebrates share the same basic nervous system b. no invertebrate is more complex than any other c. they are able to perform explorative and manipulative tasks that humans have deemed "intelligent" d. it is impossible to give octopuses and squids problem-solving tests e. they are more primitive than arthropods and echinoderms
The procedure used to determine whether a person has a heritable disease is known as
A) DNA sequencing. B) microarray analysis. C) genetic screening. D) northern analysis. E) xenotransplantation.