According to the fluid mosaic model of cell membranes, which of the following is a true statement about membrane phospholipids?

a. they can move laterally along the plane of the membrane.
b. they frequently flip-flop from one side of the membrane to the other.
c. they are free to depart from the membrane and dissolve in the surrounding solution.
d. they have hydrophilic tails in the interior of the membrane
e. they occur in an uninterrupted bilayer, with membrane proteins restricted to the surface of the membrane.

the trilobite is used as an index fossil for various geologic time periods as specific types of the trilobites were present in different geological time periods. they are a group of marine arthropods belonging to the class of trilobita.

explanation:

image result for describe the various types of gene mutationsghr.nlm.nih.gov

the types of mutations include: missense mutation: this type of mutation is a change in one dna base pair that results in the substitution of one amino acid for another in the protein made by a gene. nonsense mutation: a nonsense mutation is also a change in one dna base pair.

explanation: