Exit some whales have an underdeveloped hipbone. the hip bone is present in the anatomy but does not have any particular function in the whales' locomotion. the presence of this vestigial hip bone in a whale suggests that
a. the same homologous structure may be found in humans.
b. a mutation in the whales' dna caused the formation of a useless skeletal structure.
c. the whales may acquire the ability to live on land before the end of their lifetime.
d. the hip bone may have played an important role in the whales' ancestors locomotion.

The correct answer is D. The hip bone may have played an important role in the whales' ancestors locomotion.

Explanation:

Vestigial structures such as the vestigial hip bone in whales refer to structures or features that do not have a function or purpose and therefore are classified as vestigial. In most cases, these structures had an important function in the past but due to evolution and changes in the species, they stop being functional. This means even though the vestigial hip bone of whales does not represent a function nowadays it may have played an important role or function for the ancestors of this species (option D).

hydroxyl -oh

alcohols, always polar, can form hydrogen bonds with h2o molecules

carboxyl -cooh  

cargoxylic acids, has acidic properties which is a source of hydrogen ions, found in cells in ionized for with a charge of oh-1

carbonyl > co

ketone if within skeleton, aldehyde if group is at the end of skeleton, k & a may be structural isomers, it determines 2 sugars (ketose & aldose)

amino -nh2

amines, acts as a base, it can pick up h+ ions from surrounding solution, ionized with charge of 1+

methyl ch2

addition to rna/dna affects and gene expression

phosphate -opo3 ²⁻

organic phosphates, contributes to negative charge to, molecule that it is a part of, and potential to react with h20

sulfhydryl -sh

thiols, cross-linking stabilize the protein, and it is structure

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.