Explain the ecological significance of limiting resources, using three specific examples in your
discussion. What will be an ideal response?
A limiting resource is an environmental resource that is scarce or unfavorable to the species, and
therefore limits the ecological niche of that species. Three limiting resources are the soil’s mineral
content, temperature extremes and precipitation amounts.
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Predict what would happen to a sponge that could no longer produce spicules.
A. Intracellular digestion would cease. B. Water circulation would be greatly impeded. C. Gametes could no longer be produced. D. Vulnerability to predation would increase.
How does the acidity of the stomach aid in digestion?
What will be an ideal response?
Which of the following best describes the sequence of DNA compaction, beginning with least compacted to most compacted?
A. nucleosomes, DNA strand, chromosomes B. DNA strand, nucleosomes, chromosomes C. DNA strand, chromosomes, nucleosomes D. chromosomes, nucleosomes, DNA strand
Which of the following statements is true of reptiles?
A. Sperm are released in the vicinity of the female. B. Eggs have an amnion and a chorion. C. Eggs undergo external fertilization. D. Larvae become adults by metamorphosis. E. Embryonic and fetal development in all species is only by oviparity.