Which characteristic is an advantage that ectoparasites have over endoparasites? a. they can more easily disperse to other hosts. b. they are less exposed to predators. c. they are less exposed to changes in the external environment. d. all of the above?

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.

satellites are frequently used to make observations of the orbit on earth