The carrying capacity for a plant species can decrease when ______.
A. natural selection occurs
B. germination starts too early
C. plants evolve a quick-growing trait
D. the population of pollinators increase
E. soil nutrients are become depleted
Answer: E
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The umbilical arteries carry
A. oxygen-rich blood to the developing fetus. B. oxygen-rich blood to the mother. C. oxygen-poor blood to the placenta. D. oxygen-rich blood to the placenta. E. oxygen-poor blood to the developing fetus.
Birds use vocal displays to defend their territories
Indicate whether the statement is true or false
The boreal forests of North America are dominated by ____.
A. spruce, fir, and pine B. redwoods and sequoia C. birch and aspen D. long-leaf and loblolly pines E. cedars and junipers
Transcription produces which of the following?
a. mRNA b. rRNA c. tRNA d. mRNA and tRNA e. mRNA and rRNA f. mRNA, tRNA, and rRNA are all produced by transcription.