What reproductive benefit is obtained by the polygynous sexual habits of many marine mammals, such as elephant seals?
What will be an ideal response?
In nature, reproductive output is usually limited by the availability of eggs produced by the females. Males produce many millions of sperm and can thus fertilize numerous females without effort. Having one dominant male fertilizing numerous females ensures that only the fittest males transfer their genes to the next generation. Those males that successfully obtain and defend a harem of females are thought to be genetically fit.
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Some bacteria can insert genes into the plant genome, altering the growth and metabolism of the plant in ways that enhance the bacteria's growth
A. true B. false
What are 3 human activities that negatively affect sea turtle survival?
What will be an ideal response?
Which type of connective tissue holds bones together?
a. tendons b. intercellular junctions c. ligaments d. cartilage e. collagen
Amphibians are not especially successful land-dwellers because of their
A) two-chambered hearts. B) production of a shelled amniotic egg. C) lungs that are supplemented by air sacs. D) reliance on moist skin for gas exchange. E) choice of prey.