According to the model by Case and Taper, gene flow plays a role in limiting species ranges because
a. Alleles moving into the marginal populations are adaptive for the conditions at the margins of the species range
b. Species in the edges of the range are hybridizing, and hybrids between species have lower fitness
c. Gene flow from populations at the margin of a species range to populations in the center reduces the size of populations in the margins
d. Alleles moving into the marginal populations are adaptive for the conditions at the center of the species range
e. gene flow reduces genetic variation in marginal populations

D,

Explanation:

The Alleles moving into the marginal populations are adaptive for the conditions at the center of the species range. They therefore limit the species  range within the population  because their genes  are well expressed in the new population.And thus   increases the population sizes and variation in the (while increasing the fitness)Hence, limiting  species range and therefore promotes species expansion.

halogen, any of the six nonmetallic elements that constitute group 17 (group viia) of the periodic table. the halogen elements are fluorine (f), chlorine (cl), bromine (br), iodine (i), astatine (at), and tennessine (ts).

identify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.identify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.v