Which of the following do you expect if an individual is heterozygous for the sickle-cell trait?
a) he or she will have full-blown sickle-cell disease because the allele is dominant.
b) he or she will not develop sickle-cell disease.
c) he or she will be more apt to acquire a serious case of malaria.
d) he or she will show some symptoms of the disease.
e) none of the above.

answer: tributaries flow into rivers.

wetland is a biome that develops when the water gets accumulated in a land exhibiting a huge depression. these form either seasonally or permanently. the water in the wetland comes from rivers, lakes, ocean, flood, rain or other sources. the wetlands includes mangroves, marshes and peatland.

tributaries flow into the rivers develops a wetland because such water will get deposited in the depression and will restrict the original flow of tributary water. hence, water with low drainage current combines with the river water.

that is true   : ) hope this you