Which of the following correctly summarizes why bacteria and archaea are not in the same kingdom?
a. only archaea have cell membranes made from straight chains of peptidoglycan.
b. only bacteria are both prokaryotic and single-celled organisms.
c. archaea are believed to be the ancestor of bacteria and therefore cannot be in the same kingdom as bacteria.
d. their cell walls are created from different substances and bbacteria has an rna polymerase that archaea lacks.

The correct option among all the options is option "D

Explanation:

Cell walls are created from different substances, bacterial cell wall contains peptidoglycan and archaea lacks it in its cell wall.

Archaea lacks RNA polymerase while bacteria have an RNA polymerase. that correctly summarizes why bacteria and archaea are not in the same kingdom.

Thus, the correct option among all the options is option "D".

an adaptation is a change or process by which an organism takes to be better suited for its environment. for example; migration is a behavioral adaptation, this is needed because birds are not built to last extremely cold climates. there are different adaptations because there are different species needing to adjust to different things, bears don't migrate; they hibernate.

the element that provides strength to the exoskeletons of clams and oysters is phosphorus. this is so because calcium carbonate is the main component in the shells.

explanation: