The sequence of a dna fragment can be determined by observing the of fluorescent bands on an electrophoresis gel.
a. mass
c. temperatures
b. density
d. colors

A gel electrophoresis is used for separation of DNA (or RNA or proteins) or its fragments based on either size (mass) or charge. An electrophoresis gel can be stained in different ways. Whatever the staining is chosen, all of the fragments will glow the same color no matter what is the kind of fragments. Density and temperature cannot be determined on an electrophoresis gel.

science-ocean floors and habitats study guide by volleyballqueen3817 a major advance in ocean-floor mapping. list four sections of the ocean floor. algae that use sunlight to produce their own food through photosynthesis. all of the feeding relationships that exist in a habitat. drying out, predators, find food.

this is math not biology xd