The part of the human eye that contains the
photoreceptors is the
a. lens.
b. pupil.
c. cornea.
d. sclera.
e. retina
E
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Groups of organisms that cannot be distinguished morphologically but have no gene flow between them, and are indeed evolutionary independent units, are known as ________ species
Fill in the blank(s) with correct word
Semelparity is favored when the external environment imposes high adult mortality relative to juvenile mortality, and mature individuals are unlikely to survive much longer
Indicate whether the statement is true or false
Nearly every eukaryotic cell
A) has its genetic material concentrated in a membrane-enclosed nucleus. B) has a cell wall composed of cellulose that serves as the outer boundary of the cell. C) contains a hard, noncompressible fluid called the cytosol. D) possesses flagella and cilia, unlike prokaryotes. E) contains all of its genetic material in mitochondria.
DDT was once considered a "silver bullet" that would permanently eradicate insect pests. Instead, DDT is largely useless against many insects. Which of these would have prevented this evolution of DDT resistance in insect pests?
A) All habitats should have received applications of DDT at about the same time. B) The frequency of DDT application should have been higher. C) None of the insect pests would have genetic variations that resulted in DDT resistance. D) DDT application should have been continual.