Examlex
During the evolution of the vertebrates,gills changed from respiratory organs to filter-feeding structures.
African-Americans
A term used to refer to citizens or residents of the United States who have ancestry from any of the black populations of Africa.
Civil Rights Movement
A pivotal series of events and legislative changes, primarily during the 1950s and 1960s, aimed at ending racial segregation and discrimination against African Americans in the United States.
World War II
A global conflict that lasted from 1939 to 1945, involving most of the world's nations, including all of the great powers, eventually forming two opposing military alliances: the Allies and the Axis.
Q3: Evidence points to the ray-finned fishes (Actinopterygii)as
Q3: Sea cucumbers have an elongated body,and they
Q5: Frogs typically lay eggs in water,but some
Q7: Although most amphibians have a larval metamorphosis
Q11: The supracoracoideus muscles raise the wings in
Q17: Flies and mosquitoes belong to order _.
Q33: During conjugation<br>A)haploid micronuclei are exchanged.<br>B)macronuclei are formed.<br>C)binary
Q41: The raptors,such as hawks and eagles,are notable
Q47: Ctenophores,also known as sea wasps,are responsible for
Q48: The respiratory system in insects consists of